I'm running 6 COBs at 1400 and need to stay 16" away. So I would say 20".. be careful with all that light!Very happy with the set up. ill just keep it at a distance i already pulled the trigger and have the other 2 drivers i have a room rigtht next to that one that is same set up.Question here is it overkill for 12 inchs from canopy or if i have 16 with 1750 i can keep it at 24 inches or higher and be ok?