Quote Originally Posted by mprobasco
would cell phone light hurt them in the night stages even IF its under 5 min.? i figured it's darker than even the moon light. and i've checked on them a few times during the flowering stage with the same cellphone and they never turned herma. the area's dark as can be and the lights are on a 12/12 timer.
It takes *very* little light to stress a plant. Every cell phone screen I've ever seen produces more than enough light to stress a plant. I think you've answered your own question here.

If you *have* to check on plants, without the grow lights on, do it *right* at lights out, or right before lights-on, or use green light of the proper spectrum.