Thanks for your reply Hydro. Let me explain. the source of my information is my girlfriend of five years and I've never known her to lie or aggregate. And was telling me about her experience with her old growing source of some 25 to 30 years ago. I believe her when she said she smoked what he grew and that was good and has seen his cab with the black light coming from the cracks in it. Now the places where this falls apart is in that the source his self, 1. Was he telling her the truth? 2. How was he using was the BL's? And 3. Was he fooling himself into thinking that BL was really what made his product good? Now a few facts to throw in, my GF was in a very bad car crash some years ago and her memory is fragmented, so she is unable to give me very many details such as the questions above that I asked her about. If anything I think this guy was using some kind of grow lights during the day cycle and probably using the BL's during the night cycle possibly thinking he could still give the plants blue and red light and still have a night time for them. Then thinking he'd grown with black light. I hope he was smarter than that. But I don't really know. All of the experiments that I've researched showed time again and again that the plants that were grown under BL's were small short and did very little growing and had to be put right up to the lights. And I believe the findings showing that black lights are quite inadequate for growing with. Now knowing that, this guy is either a dumb ass and told her what he thought was true. Or he was an asshole and lied to about how it was grown and she being a very good judge of cannabis, and not knowledgeable about the growing of cannabis was led to believe what she was told. Which now brings us back to the reason for the thread and hopefully what other persons experiences if any were with BL. And maybe find out what better way to provide the thing that the "Black Light Legend" promises but cannot give, the desired "UVB Light". So to that end I decided to do the experiment myself to settle an age old conflict. I combined Soft White CFL's with BL CFL's and the out come wasn't surprising, the grow cycle of the plants was not effected by the BL's. I've since removed the BL's in added a Full Spectrum natural light CFL to the grow which the plants seem to like. But to be honest I have say that the results are inconclusive since I've only tried the experiment once and in that way. But what I think is different. From all that I've found and seen and heard the answer is no, you can't grow anything worth growing under Black Light. And that brings us to where we are at the moment the Actinic lights for fish tanks, that does produce UVB. And my other question " Can low intensity Reptile UVB CFL bulb be used in a micro grow? And if so how small of a grow could it be used in? Thanks again for your interest in the subject enough to tell me your thoughts. Keep on Tokin. "Go in a good way friend"If I had a penny for every person that toked up garbage and though it was good......
Seriously though.. I don't' doubt you can grow with them.... nor that the smoke would be terrible or anything.... But as previously mentioned, it's far from optimal so... why bother?
There are much better bulbs you can stick in the same socket that your plants will appreciate the light from.
Stay Safe!