1. JP Bedell
SDA Lighting
JP@SDAlighting.com
Blog.sdalighting.com
@jamesbedell

2. Understanding Lighting in the Age of LED

3.  Review Basic Terms Describing Light Source
 Points of Reference – Comparing LED to Traditional
Light Sources
 How to Read a Cut Sheet
 Evaluating a Sample
 Writing a Specification

4.  What is a Lumen?
 It is the measure of the total visible light emitted by a source.
 How much light a source creates or delivers.

5. SOURCE LUMENS DELIVERED LUMENS

6.  The amount of a light one candle casts one foot away.
 Think of this as the amount of light cast in a direction at
a target area. Not emanating from the source.

7. VERTICAL FOOT-
CANDLES
HORIZONTAL FOOT-CANDLES
 Light cast on vertical
surfaces such as walls, faces
and hanging artwork.
 Important for visibility,
security and visual acuity.
 Light cast on horizontal
surfaces like desks,
countertops, and the ground.
 Important for task lighting,
path of egress and basic
visibility.

8.  This is the “tone” of white light a source creates.
 Think of the difference in white light from a bright sunny
day and a warmly lite restaurant.
 Expressed in degrees kelvin
 Typically ranging from 2700K – 6000K

9.  Incandescent Light Bulb = 2700K - 2800K
 Halogen Lamp (MR16) = 2900K – 3200K
 Fluorescent Lamps = 2700K – 6000K
 Ceramic Metal Halide = 4200K (Typical)

11. 2700K 3500K

12.  CRI is short for Color Rendering Index
 This is a relative scale from 0-100 rating how well light
sources reflect colors back to our eyes.
 Commercial light sources range from 70 CRI (metal
halide) To 100 CRI (High Quality Halogen)
 LED sources are typically 80-90+ CRI

14.  0-10V
 Electronic Low Voltage Dimming (Trailing Edge)
 Triac

15. Work With Your Electrical Contractor

16. Comparing LED to Traditional Light Sources

19.  We use foot-candle targets as a guideline for providing
enough light for certain tasks and spaces.
 The 10th Edition of the IES Handbook has broken light
level recommendations down by age.

20.  Simple Orientation in space = 5-10FC
 Classrooms = 50 – 100FC
 Lobby of Office Building = 10 - 20FC
 Reading = 20 – 50FC
 Gymnasium = 20 – 50FC
 Museum = 50 – 100FC

23.  When evaluating traditional light sources wattage used
to be the point of reference. Today it must be lumens.
 A 60W Incandescent Light Bulb generates 800
Lumens. Today a 9.5 watt bulb can do the same thing.

25.  Fixture Dimensions
 Mounting
 Brightness
 Color Temperature and CRI
 Beam Spread and Optical Accessories (if applicable)
 Wattage
 Dimming Compatibility

30.  Brightness
 Color Quality
 Basic Construction

31.  Manufacturer + Part Number
 Mounting
 Complete Description
 Required Voltage
 Contractor Notes
 Customizations

32. Recess mounted LED adjustable accent light with 4-1/2" square
aperture. Fixture provided with LED light engine capable of dimming
from 3000K to 2200K in 90+CRI. Fixture provided with 0-10V dimming
driver standard. Fixture provided with trim plate complete with white
regress and flange. Fixture provided with New Construction housing
measuring 22-1/8"L X 13"W X 7"T. Fixture input voltage is 120V. Total
input wattage to fixture shall be 32 watts. Contractor to confirm
channel bar requirements and and review housing size for
construction feasibility. Electrical contractor to provide compatible
dimmers.

33. jp@sdalighting.com
Blog.sdalighting.com
@jamesbedell