I vote for 4-5 feet like knowmy said...I've used 250 at a foot and 400 at 18-24 with fan, but if it was my Horti...I would say at least 4 feet/+...Imho
latewood Reviewed by latewood on . Hieght of 1000w MH during seedling stage? All I have is a 1000W MH to pop the seeds.I've germinated them and they will be placed in the grow bags today.I'm thinking 3-4 feet above soil should be OK.I'll test heat with the back of my hand ofcourse and raise it if needed.But I don't want them to stretch either. Any suggestions. ;) Rating: 5