[NaughtyDread]

any light distance is experimental. there are the recommended and the "what i have used in the past" methods. i have gotten my 400 hps within 8 inches of the main grow stems. yes to close but not a temperature or venting issue because i could control it. when adjusting lights, it can take hours to get it right. so keep patient and remember, if air isnt moving, and moving with a way out, it will get too hot.