Uberknot
Well-Known Member
Can you post the source?
https://californialightworks.com/uvb-light-and-thc-potency/
I do find it funny they used stuff from 2009 20011 2013....and say Finally...
Don't forget the warnings....
UVB light is already generated by the mercury found in all HID (i.e. HPS and Metal Halide) light sources, but it’s typically blocked by the bulb’s outer glass jacket. Ordinary glass blocks over 90% of UVB radiation, so UVB levels will naturally be a little higher using open fixtures with no glass lens.
Many growers have been aware of the benefits of UVB and have used supplemental lighting to boost potency. However, be aware, there is a threshold where the damage to yield caused by high level UVB will exceed any benefits in potency, so caution and careful design protocols MUST be used when attempting to supplement UVB. It is also VERY important to be EXTREMELY careful using off-the-shelf UVB sources like lizard lights that are not specifically designed for humanexposure, because while sunlight has quite high levels of UVB, the intensity of the sun prevents people from staring straight at it. UVB is invisible, so your eyes can’t tell you if they are getting too much UVB from a UVB light source in your grow room, and your eyes and skin can be damaged if the levels are too high. So it’s worth repeating: Extreme caution must be observed when using secondary UVB supplementation.
LED Grow lights provide a special consideration when it comes to the effects of UVB on Cannabis THC levels. LEDs are extremely frequency specific, and a typical LED grow light with Blue, Red or even White LEDs will generate absolutely NO UVB radiation. While an absence of UVB does not appear to eliminate THC production, it is now proven that it will reduce the THC levels below those grown under sources with adequate UVB levels.