Depends on venting, how hot is your grow, etc. I usually get my 600's within 4-6" when well into flowering. I never am further than 12".
luvtogrow Reviewed by luvtogrow on . how close to the light? how close should my 600 watt light be from my lovely budding sativa? currently on 7th week of flowering, also would 11 hours light and 13 hours dark be better for last few weeks of flowering? Rating: 5