High-Yield Secondary Metabolite Production
Medicinal plants respond to UV light as a stressor. This induces the increased production of secondary metabolites that mediate many aspects of the interaction of plants with their environment such as acting as feeding deterrents against herbivores, pollinator attractants, protective compounds against pathogens or various abiotic stresses, antioxidants and signalling molecules.
Increased Production of Specific Secondary Metabolites in Cannabis
Not All UV is Created Equal
280-290 nm is the most efficient UVB wavelength range for stressing the plant (Photon Efficiency), resulting in elevated cannabinoids, terpenoids and a host of other secondary metabolites.
Even wavelengths between 290-300 nm require 10x more power/exposure than 285 nm. Simply put, to get the same effect with higher UV wavelengths requires more time and energy and may not be effective. AgricUltra lights use 285 nm UVB.
High-Yield Secondary Metabolite Production Sweetspot
A drastic increase in cannabinoids and terpenoids occurs when the 285 nm and 365 nm wavelengths are used together. This results in stronger flavours, colours, textures and aromas. AgricUltra lights use a combination of 285 nm + 365 nm UV LEDs.
Research conclusively shows an increase in cannabinoids when exposed to UVB
28% to 38% increase in cannabinoid production vs. traditional lighting technologies (e.g., HPS) Fairbairn, J.W. and J. A. Liebmann. 1974. The cannabinoid content of Cannabis sativa L. grown in England. J. Pharm. Pharmacal. 26: 413-419
Concentration of Δ9-THC increased in leaf and flower of UVB-dosed plants Lydon, John, Alan H. Teramura, and C. Benjamin Coffman. 1987. UVB Radiation Effects on Photosynthesis, Growth, and Cannabinoid Production of Two Cannabis Sativa Chemotypes. Photochemistry and Photobiology, 46:2, 201-206
20% increase in Δ9-THC when greenhouse-grown Nepalese Cannabis was given UV 4 h/day
Pate, D.W. 1994. Chemical Ecology of Cannabis. Journal of the International Hemp Assoc 2:29, 32-37
UVB and Cannabis Elimination of Microorganisms and Pest Control
285 nm is very effective in controlling powdery mildew by reducing spore germination and mycelial growth.