Dark Period Tending & Caring?

Dark Period Tending & Caring?
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I would like to know if anyone here tends/cares to there babies during dark periods? If so, what do you do to preserve complete darkness?
I thought there was a type of bulb (black light??) not sure but any help would be great.
Not sure why plants need full darkness during dark time!! Don't outdoor fields and plants have the light from moon? Not sure if moon project UV rays and all the other rays like the sun but curious to know.
If any of you uber smokers/growers have any insight I would b grateful for insight.

I cheat and and work on them for a couple minutes during dark cycle. One incandescent light on. Haven't seen any problems yet. If I remember right if you pickup a blue incandescent light it won't effect the plant.

When they are flowering. Tend to them when the lights are on. Once in a while is ok.

You can use a light with a green filter but its safer to just wait till lights on.