May 22, 2016 #1 Jdurm55 Active Member View Badges Joined Dec 2, 2015 Messages 227 Reaction score 108 Rating - 0% 0 0 0 Just picked up a t5ho metal halide combo. Just wandering how long people keep the metal halides on
May 22, 2016 #2 reefmania59 Community Member View Badges Joined Oct 1, 2014 Messages 39 Reaction score 25 Location Ottawa, Canada Rating - 0% 0 0 0 I use 250w radiums and run mine 8 hrs.