Ultra Violet (UV) light plays a significant role in all aspects of plant growth.
What Is UV?
UVA = 400-315nm
UVB = 315-280nm
UVC = 280-100nm
What Does UV Do for My Plants?
When the correct amount of UV is present, it:
- increases oils and resins
- increases root mass
- causes more branching and less stretching
- improves taste and smell
- creates higher potency plants
- increases resistance to insects, bacteria and fungus
- can speed up the seed germination process
When far-red is present, it:
- increases plant biomass
- encourages and triggers flowering
- promotes plant stretching
- enhances flower size and cell expansion
- increases the efficiency of other wavelengths
Infrared (780-1000nm): Unlikely to influence crops’ taste and smell
Far-red (700-780nm): Likely to influence a crop’s flavor and aroma, but where it enhances, some it ruins others
Red Light (620-700nm): No noteworthy influence on taste and smell
Yellow-Orange (575-620nm): No noteworthy influence on taste and smell
Green (500-575nm): No noteworthy influence on taste and smell
Blue-Violet (400-500nm): Enhances seemly all crop species’ taste and smell
UV-A (315-400nm): Likely to enhance most crop species’ taste and smell
UV-B (280-315nm): Likely to enhance a crop’s taste and smell, but too light will impair photosynthesis in most crops
UV-C (100-280nm): Potentially too dangerous to use but may increase secondary metabolites and phenolic content, however, this may only result in better resistance to diseases
Factors to consider before buying a grow light
How much does a grow light cost?
How many grow lights do I need to grow weed?
Other considerations when choosing a cannabis grow light
Ventilation/ Plant stage/ Safety