I was doing some research on this today, from what im reading it doesn't seem like a stress thing.. Apparently our plant creates thc to defend it against insects and uvb light is needed to convert cbd to thc. Our body uses UVB light for health to create vitamin D and stop scurvy, Yaaarrrr! Marijuana man has a nice little watch. Forget the the uvc and germicidal lamps, they are dangerous and will destroy your thc If anyone is interested Ive found some lamps to start. Reptile desert cfl bulb, they create some uvb and are not too expensive & Philips also do a uvb florescent light for medical purposes called Philips UVB broadband (/12) photo-therapy lamps. They are 100% UVB but are properly hard to find. It would be lovely to taste the difference.