yeah - i agree... there seems to be no "control" in any of the pics... sorta like saying
i added UVB lights when i started to flower and all my bitches took off and doubled in height over the next 4 weeks...
most people dont have 2 rooms to dedicate to such an experiment... and making hash out of 1 plant vs another is probably not effective either, because you dont know how effective your hash making skills are, and you cant be sure they are both treated evenly (you might be tired after you turn the first plant into hash, so the second may suffer)
and if i gave 20 days worth of wake'n bakes to 10 friends, they would all immediately realize i was growing
but i can say, it does make a difference... i've had several complete grows in my garden, and i've only been using UV on the last 2... it does make a difference to the bud, especially where the bud is closest to the lights... it may not be measurable in potency or thc percentages, but it changes the high, and the buds look different, more amber colors, no white hairs - they look pretty sick
i'm convinced it is a good idea - it cant hurt the plants (but it CAN hurt your eyes)... its a spectrum of light that usually never makes it into indoor gardens - and why would it unless you are growing herb? i doubt UV does anything for tomatoes or broccoli.
on another note, i changed my UV to run 10 hrs a day now, with no ill effects on the girls... no sunburn, stress, or crunchy vegetation...