hey guys i was reading on a website (cant remember where) about a month ago that if you let light in even i tiny bit in to your growing area when the lights off that it can stress the plants out and stuff up the grow and that it will have less yield and can even turn them into hems is this tru cos i was told to only spray them when the lights are off and i turn the lights on at night so i can see them during the day(when im home) and spray them when the lights are off but am i doing it wrong by letting light in when i open the door to spray them thanks for any advice dudes