Green light in grow room?

stress is a complicated thing and relevant to the strain as well. I use green lights all the time, to dump the dehum, spray, occasionally water if I'm not going to be there for lights on. I have even used a red headlamp for my light dep outside. Why did it work? Because it still wasn't as bright as a full moon. Why do plants not stress sometimes in regards to the dark cycle/light pollution? Any light leaks already present, have conditioned the plant to a dark cycle that is not completely dark (like a full moon). Wide range of variables come into play which is why some people swear that light leaks are fine and some swear that light leaks cause hermies. I have done both and in my experience comes back to stress and the relevance to the strain. I know people that walk into a flower room during dark cycle and turn on a light switch (regular incandescent) do their work and turn off the light and leave. No nanners, seeds, etc... Food for thought.

Well been busy fighting a leaf fungus infection, coming up on harvest, but looks like I might limp across the finish line, thank God, lol. So anyway on that study I have to admit its compelling and goes against the common wisdom that I and many other growers I know have considered to be gospel for decades. That said, I realize science is always pushing the boundaries and I'm willing to admit that what I know (or thought I did ;?) was wrong. And if I am, then I do sincerely apologize to anyone I've criticized or whose opinions I belittled. I know I can come off pretty heavy-handed and whether someone is right or wrong, I need to work harder at learning to disagree without being disagreeable.

Now that said, while I haven't had time to study this in depth and get a firm understanding of the implications of that research, I still KNOW what my experience tells me, and that is that green light does work in a grow room without causing problems like hermification ;?D That is something I and other growers I know have been doing for over 30 years.

Now one possibility is that, while plants may indeed absorb and use light in the green spectrum, how that spectrum is affecting the plants may not be involved in the process of photosynthesis or whatever else leads to vegetative growth. We do know that plants absorb much less green light because of the fact that they REFLECT quite a bit which, again, is why they appear green to the human eye. We also know that green light alone is not going to give a plant the energy it needs to survive, and while I haven't tried this, I'd be willing to bet that straight green light will probably kill a plant ;?) So I could see that while plants might indeed absorb some of the energy in this spectrum, that it may be quite limited and thus not stimulate all the same functions that the rest of the visible spectrum does.

If this were not true, then I and many other growers would be observing the results as plants switched from flower back to veg or would have had to deal constantly with hermification. I knew growers who consistently did work on their crops during the dark phase, sometimes for a couple of hours at a time and without seeing this happen. So logic tells me that something like this is potentially what is going on. So until I actually see any detrimental affects with my own eyes, I will continue to use green light to work on my girls whenever the need arises.

calicocalyx said:

stress is a complicated thing and relevant to the strain as well. I use green lights all the time, to dump the dehum, spray, occasionally water if I'm not going to be there for lights on. I have even used a red headlamp for my light dep outside. Why did it work? Because it still wasn't as bright as a full moon. Why do plants not stress sometimes in regards to the dark cycle/light pollution? Any light leaks already present, have conditioned the plant to a dark cycle that is not completely dark (like a full moon). Wide range of variables come into play which is why some people swear that light leaks are fine and some swear that light leaks cause hermies. I have done both and in my experience comes back to stress and the relevance to the strain. I know people that walk into a flower room during dark cycle and turn on a light switch (regular incandescent) do their work and turn off the light and leave. No nanners, seeds, etc... Food for thought.

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Same here and I agree, in nature with the rare exception it's almost never completely dark at night. I remember when I first started growing outdoors, sometimes a BIG ASS harvest moon would appear, as bright as a reading light, and I wondered how the hell that light didn't put my girls back into veg, lol.

I also agree that it's certainly strain related and these days imo a lot of these less stable strains (or bad genetics from inbreeding hermies) are much more sensitive to stress. The older strains from 20-30 years ago were much closer to the original landraces and thus hardier and resistant to stress-related problems which are much more common these days, especially recently with this ridiculous race to create and MARKET new strains on a nearly daily basis.

If you want to see in the grow room during lights out, use 730nm.

Seriously though, just wait until the lights come on.

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always opt for noneletrical solutions as lites use enogh already.