Yeah it's in my bedroom and the light kills me or I would have it on that long when I do the NL I'll have to make sure it's on 20/4 this is kinda my first grow and I'm still new to things but I have read and learned ALOT! This is for personal use and I don't smoke much at all I'm going to use it to help me sleep! At night I do nothing but think about shit and it gets old fast! I miss my deep sleep I used to have so I'm growing basically for that perpose