the rays put the plant like in a defense so it produces more resin. I have seen a increase in the resin output. i always have 4 plants going and whenever i try something new i will take 2 of them and try it on those 2 and leave the other 2 normal. same when i started using molasses. i used it on 2 and didnt on my other 2. same strain each time. the blacklight plants came out a lil more white then the 2 i left in the normal grow room. Tried it out twice b4 i actually did it to all 4 plants same as when i did it wit the molasses also. and i am always tryin to find new things to try. (just nothing 2 crazy) like the one dude who wanted to drill the plant at the bottom.*still waiting to hear how that turned out for him