I'm wondering about light from tent accessories such as: power lights on a dehumidifier, IR from cameras, etc. I understand NO light during dark period, but is there a point of usable light from such things or is the illumination so low that it doesn't interfere. Plants grow outside , and the moon can become quite bright. Is there a line of see able light to humans but not useful to plants or does no light, mean NO LIGHT. I how that makes sense all input is appreciated.