ah just realised u had a 400W. i'd keep it a little further away. a good way to test would be to pic a leaf (similar to the texture of a cannabis leaf) & put that under the light, if it just dry's out it'll prob be ok, but if it burns then it's not!
dreadydrug Reviewed by dreadydrug on . Recommend height for MH lighting i have some seedlings starting i was reading that having ur mh light to low will fry ur seedlings and then having it to high causes it to stretch , from what ive read 5 feet is the norm, but i was wondering what u guys thought about 4 feet high for the seedlings and im not to sure after they start growing like during veg and bloom how high i should keep it. thx guys, my average temp is between 72-78 night and day so any help or suggestions would be nice, i know i gotta test it for my self as Rating: 5