Lighting for Horticulture- Learning Objectives
Horticulture Lighting Webinar
The bewildering array of light sources and lighting fixture choices is confusing. Understanding how colors appear under different light sources, CRI, CCT, and other metrics for color rendering, and controlling glare are all important lighting challenges. 
The three types of Growth
New Paradigms in Photobiology: Redefining Photosynthetic Photons
PRESENTER:Bruce Bugbee, Utah State University
Description of Webinar: October 15th, 2020
Here I review the emerging evidence that far-red photons (700-750) have photosynthetic activity and should be included in our definition of photosynthetic photons. This has profound implications for all of plant science.
The dose of light; duration, intensity, and color, in addition to water, CO2 and nutrients, all contribute to the health of the plant. In this excellent webinar I learned that most plants need to rest, like people need to sleep, tomatoes need 8 hours of darkness, while wheat and radish do not.
Although plants may not need green wavelengths to thrive, it is essential for humans to be able to see and monitor small green insects.
Far Red light, above 700 nm, is being studied for the positive response in growth; however, it depends on the plant. It seems that if the plant is shade loving, the longer wavelenghts can be beneficial in increasing leaf size. While it makes lettuce grow larger leaves, it makes cannabis grow taller.
Current studies will likely expand the photosynthesis curve from 400-700 nm to 400-750nm.
CRI will be replaced with CFI, and the IES TM-30 CFI, Color Fidelity Index, will become the new standard within the next ten years.
Why is LED Grow Light Purple?
LED's for Horticulture
Osram Opto expands horticultural LED line with purple and broader white spectra