Mikedin
Living Soil Student
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I have mine on a separate timer, they come on about a half hour after lights on, they stay on for 1 hour then off for 3 then on for 1 off for 3 u til the light cycle ends, pretty much how I’ve always ran them since I got them.The ir also helps resin and potency production. The additionals definitely help against stretch as well as a better yield, also helps the THC mature a little more evenly in my opinion. Some try to say it makes it flower faster, but I haven't seen that, that's is a myth from what I have seen other than it helping the stack on the buds and potency. You are correct to use them during the different phases of flowering. I have mine turn on a few hours after my main lights turn on, then two hours before lights out. I haven't tried running them the whole day because I have heard that it isn't necessary to have them on the whole day.
I wouldn't suggest running them the whole lights on schedule I did one and saw no real difference, problem is really tthat most of them use UV-A which isint as potent of a UV, UV-B if they are true UV-B I’ve heard can be used to prevent and eliminate diseases like PM etc, some farms use them mounted on trailers they pull through the fields, they do it just after dark and just before the sun comes up I think for as little as 5 minutes
From what little research I’ve done I hear it is legit, problem is you wanna be careful and cover your eyes and skin if you’re in the tent or grow rim when they are on, it is intense UV after all. Still not anywhere near as dangerous as constant exposure to UV-C but worth the protection if you’re in the rooms or tents constantly