I use a green cfl party light to tend to my plants at night. My system runs at night and is dark during the day. When I wake up I go downstairs, flip on the green light (which is outside my box), and foliar spray them. I think some people forgot on this thread that you do have to tend to your plants at night to foliar spray. It is a 16 watt green cfl that lights up my basement with no other lights and I still have to open the door to my cab (which is 100% light proof at night) to spray them. It is still pretty pitch black inside that cab and the foliar spray only last 5 minutes so I doubt that green light makes a difference. Just don't leave it on for that long. And yes the plant does absorb a small amount of green light.