Entering your grow room when the lights are off is possible but should be done with care to not disturb the plant’s natural rest period. Use a green light, as it’s less likely to affect plant cycles. Limit your time inside to avoid disrupting the dark cycle. No specific duration is safe for all plants; keep visits brief. You’ll need to purchase a green flashlight or bulb. Frequent or prolonged exposure to light during dark periods can stress plants, potentially affecting growth and flowering.