The spectral range includes ultraviolet, violet, blue, green, yellow, orange, red and far-red light energy. Below are the specific nanometer ranges for each section and their benefits to plant growth.
UV = 280-400nm
Gives the plant a solid base and creates protection for the plant. Enhances the color, taste, and aroma of the plant.
Blue (and Violet) = 400-520nm
Crucial for photosynthesis and vegetative growth. Reduces plant stretch and promotes tight internodal spacing. More exposure to this light can increase a plant’s growth and maturity rates.
Green = 520-560nm
Relatively low amount absorbed by plants compared to the other colors, though it is essential for canopy penetration and has been found to enhance the production of chlorophyll which helps with photosynthesis while giving the plants a greener color.
Yellow = 560-590nm
Less effective for plant growth than other colors. Helps improve efficiency of canopy penetration.
Red (and Orange) = 590-710nm
At the peak of the McCree curve for photosynthetic efficiency. Drives photosynthesis and is used heavily during flower production. Regulates photoperiod. When combined with blue light in the flowering stage, it helps with a higher quality yield. Utilize red and far-red light to trigger flowering or encourage more bud development.
Far-red = 710-850nm
Can have a major effect on plant shape and size. Promotes plant stretching. Increases plant biomass. Regulates flower when used in the right ratio with red.