I know there are people who use a green light to enter their grow room during darkness hours when the plants are flowering. As much as some people swear by it being acceptable, others feel it can create plant stress and herms. Personally, I don't enter at any time during dark hours when the plants are flowering. I'd rather be safe than sorry. I've seen too much contradiction on this subject to be on one side or the other.
Once cut, the plants begin to die and photosynthesis stops. While you don't want to dry your buds in bright light and high heat, turning on the light to inspect them during drying will cause then zero harm. Just leave the lights off when you're not in there looking at them.