This project focuses on developing an intelligent lighting control system for greenhouses using LED grow lights. The system aims to 1) reduce supplemental lighting energy consumption by optimizing LED light intensity and 2) improve crop productivity by manipulating light quality using LED spectrum control. It consists of an intelligent sensor network, distributed control nodes, and controllable LED lights.

1. Abstract
This project focuses on lighting control in greenhouse production to achieve optimal
plant growth. The concept can be applied to other environmental variables such as
temperature, humidity, and CO2. We propose a system comprised of an intelligent
sensor network, distributed control nodes, and LED grow lights with the following
characteristics:
1. To reduce the supplemental lighting energy consumption by optimizing
LED grow-light intensity through advanced controls
2. To improve crop productivity by using the spectrum modification capabilities of
LED technology to manipulate the light quality within a greenhouse environment.
.
Background
System Design
References
1. Massa GD, Kim HH, Wheeler RM & Mitchell CA. Plant productivity in response to LED lighting. HortScience.
2008;43:1951–1956.
2. Vänninen I, Pinto DM, Nissinen AI, Johansen NS & Shipp L. In the light of new greenhouse technologies: Plant-
mediates effects of artificial lighting on arthropods and tritrophic interactions. Ann Appl Biol. 2010;157:393–414.
3. Chen P. Chlorophyll and other photosentives. In: LED grow lights, absorption spectrum for plant photosensitive
pigments. http://www.ledgrowlightshq.co.uk/chlorophyll-plant-pigments/.Accessed 12 March 2014.
Acknowledgments
This research has been supported by the Pacific Institute
of Climate Solutions and the School of Mechatronic
Systems Engineering at Simon Fraser University
Intelligent Control Systems for Energy-efficient Lighting in Greenhouses
Alex Jun Jiang (PhD Student), Mehrdad Moallem (Professor)
School of Mechatronic Systems Engineering
Hardware Set Up Data Insights
Control Factors
1. Photoperiod Control
Control the flowering period
2. Photomorphogenesis Control
Control the seed germination, seedling development,
and the switch time from vegetative to the flowering stage
Affects disease resistance, taste, and nutritional levels
The above can be achieved by customizing red and
blue light ratio for making optimal light recipe for growing
various crops
3. Illuminance Control
Control supplemental light intensity in the presence of
natural light for photosynthesis during the winter season or
overcast days.
Light Duration
Energy
saving at
least
• 70%
Crop yield all year
around
•365
days
Increase the crop
quality control
precision
•40%
Reduce
cultivation time
•30%
Light quality
Light intensity
 Absorption spectrum in
photosynthesis process of
plant
 Mainly blue light and red light
Cloud Server
Light Fixtures
Gateway
Internet
Ethernet
Router
Wireless
Distributed lighting system with
multiple LED-luminaries where
each fixture is:
•Wireless enabled to exchange
information with other luminaries
and a local control unit
•Ambient light sensor to detect
light level
•Continuous dimming capability
Energy-efficient Lighting
- Power Drives for HB LED
 Small capacitors for increased
lifetime
- Low-cost Single Stage Power
Driver
- Distributed lighting control with
daylighting strategies
LED Grow Light
Control modules inside LED lights
TI MCU
User Interface
Sensors (Temp,
Humidity, CO2,
quantum