1) The document discusses the role of light management films in LED luminaire design. It describes how light management films can help obscure individual LED points and create a more uniform glow, while efficiently extracting light.
2) Two types of films are covered: diffusion films, which scatter and soften light, and collimation films, which concentrate and shape light. Proper film and cavity design are needed to balance light redistribution and extraction.
3) Measurements of films alone can be misleading, as film performance depends on interacting with the optical cavity. Integrating sphere measurements capturing total system output are most informative.
led – the future of lighting
We know the whole spectrum
“LED’s greatest advantage is also its greatest challenge. Balancing efficiency with ergonomics. Combining good economy and lighting comfort. And we’re there now.”
Leif Norrby, Product Development Director, Fagerhult
The Save as you Pay - Pay as you Save (TM) program from Reel Caribbean Energy LLC for businesses in the Caribbean is designed to create significant savings on utility expenses through LED lighting. The program and concept have been designed to simply save members money on their current utility bills while utilizing current technology. The program highlights and particulars are included in the Power Point Presentation above.
The program ultimately saves you approximately 20 to 40% of your current monthly electric bill through the use of LED technology. Savings and terms vary depending on your current utility provider’s cost per KwH.
For more information, visit http://reelcaribbeanenergy.com.
Role play - Revolution for the light bulb - NanotechnologyNANOYOU
Role play to engage students on a dialogue about the ethical, legal and social aspects of nanotechnologies.
For more resources on nanotechnologies visit: www.nanoyou.eu
led – the future of lighting
We know the whole spectrum
“LED’s greatest advantage is also its greatest challenge. Balancing efficiency with ergonomics. Combining good economy and lighting comfort. And we’re there now.”
Leif Norrby, Product Development Director, Fagerhult
The Save as you Pay - Pay as you Save (TM) program from Reel Caribbean Energy LLC for businesses in the Caribbean is designed to create significant savings on utility expenses through LED lighting. The program and concept have been designed to simply save members money on their current utility bills while utilizing current technology. The program highlights and particulars are included in the Power Point Presentation above.
The program ultimately saves you approximately 20 to 40% of your current monthly electric bill through the use of LED technology. Savings and terms vary depending on your current utility provider’s cost per KwH.
For more information, visit http://reelcaribbeanenergy.com.
Role play - Revolution for the light bulb - NanotechnologyNANOYOU
Role play to engage students on a dialogue about the ethical, legal and social aspects of nanotechnologies.
For more resources on nanotechnologies visit: www.nanoyou.eu
Task -Ambient lighting provides energy saving but space surrounding the users is dim and unpleasant. This study research into the proposal of an additional Surround Layer of light. It examined illumination requirements, dimensionality and appearance of the space by the use of Vector/Scalar and Task/Vertical Illumination Ratios. They were evaluated under several illuminance requirements, Task-Surround combinations and Surround Light source sizes. The results showed that by adding a Surround Light Layer, visual quality of space surrounding the users can be enhanced and energy savings can be achieved.
Presented by: Peter Ngai
VP, Innovation, Acuity Brands Lighting
Kevin Settlemyre of IES, a unique energy modeling software organization, will discuss energy modeling, how it is changing the design and construction process, when it can be used most effectively, how to use it to reduce your carbon footprint, and how to use IES' Virtual Environment software. The roundtable is a unique opportunity to learn about an innovative energy modeling software program from an expert with a number of years' experience in green building and energy modeling. Literature will also be provided discussing ways that energy modeling can be used and different energy modeling software programs that can be used in high performance building.
Here is a data sheet on the Dukane 8421 DLP ( Digital Light Processor) projector from Dukane.
Bill McIntosh
School Vision Inc ( my consulting company)
Authorized Dukane Consultant
Phone :843-442-8888
Email :WKMcIntosh@Comcast.net
Twitter : @OtisTMcIntosh
SchoolVision Website on Facebook: https://www.facebook.com/WKMIII
You can find information on all of Dukane products here
http://www.slideshare.net/WKMcIntoshIII/documents
http://www.slideshare.net/WKMcIntoshIII/presentations
http://www.slideshare.net/WKMcIntoshIII/videos.
Here is the main the main Dukane website
www.dukane.com/av
ESP Brochure highlighting Design Systems\' Sustainable Service Offerings - Let us start you on the path of personal and corporate “green” responsibility – for as little as $1,000 we can perform an initial audit of your facility.
Hi-Tech provides building energy modeling and analysis services. Check the key points of our services below.
1) To qualify the building for EPACT Certification using eQuest.
2) Interior, Exterior & Day Lighting reports for existing & proposed design.
3) Review of existing buildings, HVAC systems, lighting etc. & possibly save up to 60% in the proposed design, better than the Code.
4) Comparison of existing & proposed systems with respect to the Baseline Appendix-G ASHRAE 90.1.
5) Technical assistance to reduce energy consumption as per international standards (i.e. ASHRAE 90.1), local authority regulation & as per client’s requirements.
6) Software Used for Energy Modeling : eQuest 3.64, DiaLux, COMcheck & AutoCAD.
For any queries please email us at info@hitechcaddservices.com
Residential Applications for LED Lighting: How LED lighting is creating opportunities for creating dynamic lighting layering in residential spaces
LEARNING OUTCOMES
To better understand the key benefits of using LED lighting in residential applications.
To better understand how LED technology is positively impacting lighting design objectives when using lighting layers.
To better understand the specific benefits of LED lighting in kitchen and baths.
To better understand the primary specification issues that designers and architects must define when selecting and applying LED decorative and architectural lighting in residential applications.
To analyze specific case studies of successful LED lighting application.
This session is proudly sponsored by Residential Lighting
Presented by: Joseph A. Rey-Barreau, AIA, IES, i
Stonco is proud to unveil our brand new LED site lighting package featuring Philips LifeLED Technology. Our package includes a collection of architectural area lights, wall mounted sconces and ceiling mounted parking garage and canopy luminaires.
Choosing Lenses For Power Led Based Luminairevfurlan
There are many Power LED lens manufacturers worldwide. Each of them is producing lenses for determined types and manufacturers of Power LED. LED are all different so that one lens can be used on only one LED. From experience gained in the last months, we can say that a significant part of these lenses are not so dedicated and the results are quite different from expectations. When measuring lenses in combination with adequate LED we focused our attention on efficacy, repeatability, consistency with the nominal data and problems with the installation.
Task -Ambient lighting provides energy saving but space surrounding the users is dim and unpleasant. This study research into the proposal of an additional Surround Layer of light. It examined illumination requirements, dimensionality and appearance of the space by the use of Vector/Scalar and Task/Vertical Illumination Ratios. They were evaluated under several illuminance requirements, Task-Surround combinations and Surround Light source sizes. The results showed that by adding a Surround Light Layer, visual quality of space surrounding the users can be enhanced and energy savings can be achieved.
Presented by: Peter Ngai
VP, Innovation, Acuity Brands Lighting
Kevin Settlemyre of IES, a unique energy modeling software organization, will discuss energy modeling, how it is changing the design and construction process, when it can be used most effectively, how to use it to reduce your carbon footprint, and how to use IES' Virtual Environment software. The roundtable is a unique opportunity to learn about an innovative energy modeling software program from an expert with a number of years' experience in green building and energy modeling. Literature will also be provided discussing ways that energy modeling can be used and different energy modeling software programs that can be used in high performance building.
Here is a data sheet on the Dukane 8421 DLP ( Digital Light Processor) projector from Dukane.
Bill McIntosh
School Vision Inc ( my consulting company)
Authorized Dukane Consultant
Phone :843-442-8888
Email :WKMcIntosh@Comcast.net
Twitter : @OtisTMcIntosh
SchoolVision Website on Facebook: https://www.facebook.com/WKMIII
You can find information on all of Dukane products here
http://www.slideshare.net/WKMcIntoshIII/documents
http://www.slideshare.net/WKMcIntoshIII/presentations
http://www.slideshare.net/WKMcIntoshIII/videos.
Here is the main the main Dukane website
www.dukane.com/av
ESP Brochure highlighting Design Systems\' Sustainable Service Offerings - Let us start you on the path of personal and corporate “green” responsibility – for as little as $1,000 we can perform an initial audit of your facility.
Hi-Tech provides building energy modeling and analysis services. Check the key points of our services below.
1) To qualify the building for EPACT Certification using eQuest.
2) Interior, Exterior & Day Lighting reports for existing & proposed design.
3) Review of existing buildings, HVAC systems, lighting etc. & possibly save up to 60% in the proposed design, better than the Code.
4) Comparison of existing & proposed systems with respect to the Baseline Appendix-G ASHRAE 90.1.
5) Technical assistance to reduce energy consumption as per international standards (i.e. ASHRAE 90.1), local authority regulation & as per client’s requirements.
6) Software Used for Energy Modeling : eQuest 3.64, DiaLux, COMcheck & AutoCAD.
For any queries please email us at info@hitechcaddservices.com
Residential Applications for LED Lighting: How LED lighting is creating opportunities for creating dynamic lighting layering in residential spaces
LEARNING OUTCOMES
To better understand the key benefits of using LED lighting in residential applications.
To better understand how LED technology is positively impacting lighting design objectives when using lighting layers.
To better understand the specific benefits of LED lighting in kitchen and baths.
To better understand the primary specification issues that designers and architects must define when selecting and applying LED decorative and architectural lighting in residential applications.
To analyze specific case studies of successful LED lighting application.
This session is proudly sponsored by Residential Lighting
Presented by: Joseph A. Rey-Barreau, AIA, IES, i
Stonco is proud to unveil our brand new LED site lighting package featuring Philips LifeLED Technology. Our package includes a collection of architectural area lights, wall mounted sconces and ceiling mounted parking garage and canopy luminaires.
Choosing Lenses For Power Led Based Luminairevfurlan
There are many Power LED lens manufacturers worldwide. Each of them is producing lenses for determined types and manufacturers of Power LED. LED are all different so that one lens can be used on only one LED. From experience gained in the last months, we can say that a significant part of these lenses are not so dedicated and the results are quite different from expectations. When measuring lenses in combination with adequate LED we focused our attention on efficacy, repeatability, consistency with the nominal data and problems with the installation.
LED Strip lighting has so many fun applications. Their high brightness and intensity have made them usable even in the manufacturing of goods. If you wish to make a mass purchase of these cool LED lights, use terminologies such as downlights Sydney and LED strip profiling to get a list of options to choose from and in your budget.
For more detail, please visit our website: https://ledlighting.com.au/
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
In his public lecture, Christian Timmerer provides insights into the fascinating history of video streaming, starting from its humble beginnings before YouTube to the groundbreaking technologies that now dominate platforms like Netflix and ORF ON. Timmerer also presents provocative contributions of his own that have significantly influenced the industry. He concludes by looking at future challenges and invites the audience to join in a discussion.
Unlocking Productivity: Leveraging the Potential of Copilot in Microsoft 365, a presentation by Christoforos Vlachos, Senior Solutions Manager – Modern Workplace, Uni Systems
Communications Mining Series - Zero to Hero - Session 1DianaGray10
This session provides introduction to UiPath Communication Mining, importance and platform overview. You will acquire a good understand of the phases in Communication Mining as we go over the platform with you. Topics covered:
• Communication Mining Overview
• Why is it important?
• How can it help today’s business and the benefits
• Phases in Communication Mining
• Demo on Platform overview
• Q/A
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...
Light Management Films In Led Luminaire Design
1.
Light Management Films in LED‐based Luminaire Design
Donald Hirsh & Robert Wood
Bright View Technologies, Inc.
Morrisville, NC USA
Introduction
LED-based designs for every form of illumination are expanding at a rapid pace. With LED
manufacturers promoting exceptional product lifetimes, environmentally friendly materials, and high
efficacy, lighting designers are following suit with new generations of product appearing on the market
from both startups and the mainline players in the industry.
Efficiency figures posted by Department of Energy show solid state lighting (SSL) far ahead of
incandescent lighting, and rapidly overtaking compact fluorescent (CFL) lighting efficacy in 2007 1 .
Regarding lifetimes, Cree rates its XR-E power LED at 50,000 hours with lumen maintenance of 70% of
original output as long as LED junction temperatures do not exceed 80° C 2 .
The winning advantages of LEDs must be translated into winning systems designs for widespread
adoption to take place. In Bright View’s work, supplying light management films to the display and
illumination marketplaces, we have observed many luminaire designs that are effective in mechanical,
thermal and electrical efficiency, but relatively fewer that are optically efficient as well. Ultimately, if a
light fixture does not exhibit optical efficacy, it will not fulfill the potential of LED technology.
There are several approaches to achieving a commercially acceptable combination of aesthetic quality
and optical efficacy. Light management films, used in conjunction with well-designed optical cavities,
can be a critical and enabling component in good systems design.
Two recent reviews provide overviews of efficient LED lighting design principles 3,4 . Solid state lighting
metrology is well documented 5 , but until recently little has been written about efficient optical design 6 .
1
DOE Solid‐State Lighting CALiPER Program, detailed at http://www.netl.doe.gov/ssl/comm_testing.htm
2
Negley, Jerry and van de Ven, Anthony, “Essentials of designing efficient luminaires with LEDs,” LED Magazine, February,
2008
3
Negley, Op Cit.
4
Riesebosch, S., Essentials for Designing LED Luminaires. LEDs Webcast, LEDs Magazine, Pennwell Publishing, (2008).
5
Approved Method: Electrical and Photometric Measurements of Solid‐State Lighting Products, IES LM‐79‐08, IESNA, 2008.
1
2. In this white paper we will present a review of the critical role of light management films in creating
attractive solid-state lighting fixtures.
A Hundred Points of Light
In the not-too-distant future, we may be able to design high brightness luminaires with a very small
number of very bright LEDs. The newest LED packages such as PhlatLight LED packages from
Luminus or the recently announced XLamps-MC from Cree point to this. But for the time being,
virtually every SSL developer finds the most cost effective way to deliver high flux fixtures is to develop
luminaires constructed from arrays of LEDs, often-times large arrays with dozens or even hundreds of
elements. For example, Cree recently introduced the LR6, an LED based downlight compatible with
conventional ceiling fixtures. At 600 lumens, the LR6 has output comparable to a 65 Watt BR30, 50W
PAR30, or a 100W A-lamp when installed in typical 6" downlights. The LR 6 also provides an
impressive CRI of 95. This is achieved through the use of forty-two mixed color LEDs in the LR6 light
engine.
Per‐LED or Per‐System Optics
There are two basic schools of thought in the development of LED-based fixtures. In the first approach
the system and optics are designed around the LED itself. The point-source of light is integral to the
aesthetic quality of the LED and the LED fixture does nothing to hide this. This type of fixture
“celebrates” the pointy light source and makes it an integral part of the design. Diffusion and mixing
are performed in the environment rather than in the luminaire. Fixtures from Beta-Kramer-LED are
exemplary of this school of design and employ discrete optics, coupled to individual LEDs to deliver
efficient light extraction from the luminaire.
Figure 1: Emitting Surface Drawing, & Picture of a Kramer‐LED Linear Pendant
This class of design is naturally aligned with contemporary or modern design and relies on the diffusive
character of surfaces in the illuminated space to soften and diffuse the light. However, the corollary is
that direct, multi-point LED illumination does not emulate traditional lighting designs compatible with
6
Lewin, Ian, “Absolute photometry measurement has relative benefits for LED and SSL performance evaluation,” LED
Magazine, August, 2008.
2
3. traditional architectural and interior design. Under some circumstances, the point-source nature of the
individual LEDs can pose glare problems.
The other school of thought in LED-based luminaire design is to obscure the individual LEDs and seek
to have the fixture “glow” like a conventional luminaire. One approach is to obscure by the use of
indirect reflection in the fixture itself. This is the design principle at work in the downlights developed by
Renaissance Lighting.
Figure 2: Cross Sectional Illustration of Renaissance Lighting ED04/6 Downlight
Another approach is to obscure a multi-point grid of LEDs by the use of diffusion films in the path of the
LEDs. These two photographs of a representative multi-LED downlight (with and without its diffuser)
illustrate the approach.
Figure 3: A multi‐LED downlight with and without a task‐optimized diffuser
The challenge for both these designs is the conflicting imperatives to redistribute the flux from the
multiple LEDs and to extract as much of the redistributed light out of the luminaire and into the
illuminated space. In both approaches, the design of the optical cavity and its interaction with the
components within the fixture are critical in determining the overall light extraction efficiency.
3
4.
Light Management Films
There are two major classes of light management films used in illumination applications, diffusion and
collimation films. The former scatter the illumination source, the latter concentrate or shape the source.
From stretched animal skins, to patterned and etched glass, people have attempted to soften the glare
of harsh illumination sources - well, ever since there have been harsh illumination sources to diffuse.
For example, the emergence of frosted glass diffusers in the 1920s was a significant advancement in
electric lighting because the glare of a single filament could be could be converted to a much larger
glowing orb with less glare and softer shadows. The most common light management film in
illumination applications, diffusion - no matter what the technology - redistributes the light through
scattering and/or refraction. The ability to achieve an acceptable balance between light extraction
efficiency, light redistribution, and aesthetic quality relies heavily on the design of the light management
film.
Modern micro-optic production techniques have allowed for the creation of a new generation of
diffusion structures that offer considerable flexibility in distribution pattern and level of diffusion. Modern
diffusers can exhibit deterministic patterns through refraction, rather than scattering – thereby delivering
far-field geometric patterns with greater precision than previous technologies. Management of the
interaction between the diffusion film and the optical cavity permits optimization of the quality versus
quantity proposition necessary in multipoint luminaire design. Unlike previous generations of diffusion
materials, newer microstructure-based diffusers can be “tuned” to the properties of the optical
subsystem to achieve the desired result.
Bright View’s development of ACEL LED light-management films was driven by 4 major criteria,
common to all LED-based luminaires. The film must;
Depixellate (hide) the individual LEDs
Create a homogeneous, pleasing “glow”
Extract light efficiently from the luminaire
Provide optimum shaping of the far-field light pattern
Bright View’s ACEL diffusion films are designed to work in combination with efficient back reflectors
lining the optical cavity. The diffuser reflects a portion of incident light back into the light cavity in order
to create the required mixing. Light that is reflected back into the cavity must be efficiently recycled by
the reflective material lining the cavity to achieve high efficiency. We found the use of reflective
materials having white diffuse reflectance exceeding 96% could give light extraction efficiency as high
as 92% based on integrating sphere measurement.
The optical effect of the Bright View film in conjunction with the reflective lining material creates a new
light emission pattern, a cone that may be much wider than the emission profile of the LED itself. The
measurement of the total light output from the luminaire can only be done using a large format
integrating sphere or goniophotometer capable of capturing light output into a full hemisphere (+/-90° in
all directions).
4
5. c
d
a
b
LED backplane
Diffuser
Figure 4: Side view of luminaire emission/reflection: the light paths within an LED luminaire may be classified by (a) primary emission
from LEDs within a defined cone; (b) reflection from the diffuser; (c) reflection from the light cavity; and (d) transmission through the
diffuser within a cone that is broader then the LED primary cone. Complex interaction among the components of the luminaire
determines the final resulting light cone and aesthetic “look” of the light fixture.
Because of the strong interactions between optical cavity and light management film, measurement of
either component in isolation can produce misleading results. For example, measuring diffuser film
total transmission via ASTM D1003 7 may show a particular diffuser has less than 80% transmission,
while an integrating sphere measurement of the total light output from a luminaire equipped with the
same diffuser may show more than 90% extraction. How can this be? One of the subtleties of
diffusers used in luminaires is that a significant portion of the light incident on the diffuser surface is
reflected, rather than transmitted on the first pass. Reflected light (path (b) in the figure above) may still
be extracted from the luminaire if it can be “recycled” through efficient reflection from the cavity (path (c)
in the figure). Thus, it is important to consider the efficiencies of both the diffuser and the cavity.
The geometric design of the LED luminaire has profound and often unpredictable effects on efficiency,
depixellation, far-field light pattern, and the aesthetic “look” of the light fixture. Spacing between LEDs
and distance of LEDs from the diffuser plane are the most important parameters, but the exact shape of
the cavity plays a critical role as well. As such we have developed a variety diffuser models to work
with specific luminaire designs, such as the generic example shown below 8 .
7
ASTM D1003 ‐ Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics, (2000).
8
This design is not modeled or optimized in any way. It is a simple reference design that allows us to describe a series of luminaire
production techniques.
5
6. BVT-LED-ACEL Diffuser
Light mixing cavity
LED Backplane
(heat sink not shown)
White LED
0.5W
110 70
White reflector
R > 96%
Dimension in mm
45
Side View End View
Figure 5: Generic LED‐Luminaire Layout
In Figure 5, an illustration of a generic LED luminaire design, the LED backplane consists of twelve
white LEDs (~0.5W each) mounted on a white reflective board and heat sink. The light mixing cavity is
conically shaped and lined with a white reflector having diffuse reflectance >96%. The Bright View film
is mounted behind a rigid clear acrylic disk, with the film clamped along its edges, providing an optical
air gap between the film and the disk 9 .
The design of optical cavities in luminaires is incredibly varied and modes of film/cavity/source
interactions are complex. Task-optimized modeling software such as Photopia, Optis or LightTools
may be employed to create useful and predictive performance models, which can offer illuminating
evidence of these complex interactions. But an excellent example of the strong interaction between
certain kinds of films and optical cavities comes from the world of backlight design, where Bright View
has a substantial product development and systems modeling program creating collimation films.
Designed for the LCD-backlight market, Bright View’s LCD-ACE-1F film is a single film solution for LCD
backlights – the illumination components of LCD TVs and monitors, replacing multiple diffusers and
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Application notes:
1. For best results, the ACEL diffuser must be mounted with its backside facing the LED sources and its front side facing the
viewer space. When placed on a flat surface with the clipped notch in the upper right‐hand corner, the front side will be
facing up and the backside will be facing down.
2. Both surfaces of many ACEL Light Management Films contain optically active structures and therefore must not be
mounted in a manner that causes optical coupling or planarization of either surface. Use edge clamping or edge taping to
mount the film in the luminaire.
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7. gain films with a single film. The backlights illuminate the liquid crystal displays and are designed to
stringent tolerances for uniformity of illumination field (flux, colorimetry and homogeneity) and on-axis
gain. LCD-ACE-1F performs homogenization and mixing as well as delivering on axis gain.
Figure 6: Cross Section of a Liquid Crystal Display (LCD)
The gain profile of the film in the floor-to-ceiling axis, compared to the roughly lambertian profile of a
backlight without a film, looks like this.
Figure 7: Normalized Profile of 32” LCD TV Backlight With and Without BVT Collimation Film
Experimental data corroborates the graph below from one of our system models, which shows the gain
of our 1F film as function of the efficiency of reflector used in the optical cavity which our film covers.
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8. Figure 8: Gain versus Cavity Efficiency ‐ Using BVT‐LCD‐ACE‐1F
Basic measurements of light management films do not tell the whole
story
Integrating sphere measurements of Bright View’s ACEL Light Management Films show efficiencies
above 92% when coupled with an efficient optical cavity. This same film, when measured in a less
controlled setting with a conventional hemispheric-headed photometer and a single LED might
demonstrate 55-70% transmission. And the same film/configuration when measured with a spot
photometer yields stranger results still, as the table below illustrates.
Generic Square Spot Hemispheric
LED‐based Photometer Photometer
Luminaire (cd/m²) @ 8” (cd/m²)
Uncovered
6800 1005
LEDs
BVT Diffuser 3240 914
BVT Diffuser +
1/8” Clear 940
Acrylic
Generic Acrylic
812 752
Diffuser
715
Sabic 3805GZ
Table 1: Measurements of a Luminaire with Photometers
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9. Clearly, simple measurements of transmission, reflectivity and haze do not tell the whole story about
optical films when used in illumination systems. This is one of several cases where system efficiency,
particularly luminous efficiency, is not simply the linear multiplication of components multiplied together.
In good design, system performance can be greater than sum of the parts.
Conclusion
Common wisdom holds the acceptance of LED lighting rests on three features: green technology, long
life, and energy efficiency. But LED luminaires will not be accepted until they are also beautiful,
aesthetic and functional.
Diffusion and collimation are already prevalent in almost every form illumination and makes our living
and working environments feel warm, comfortable and inviting. A working environment with properly
diffused illumination makes for good visibility in task-driven work and lack of glare. Good illumination –
uniform, smooth and glare-free – is what makes for space that “feels good” to be in.
Bright View’s ACEL Light Management Films give the lighting designer advanced new elements to
include in modern, efficient and attractive luminaire design.
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