- Jan 23, 2015
- Reaction score
400w MH how high should it be? just started veg of 2 plants. it's currently about 12".
At least 18" - 24" I use the back of my hand method, if I can keep it there on top of the canopy for a whole minute without it getting hot the the light is at the right height. But that's on an open reflector hood. With a good fan blowing just under the hood and over the canopy i can keep it around 20". Younger plants cant take the intense light.400w MH how high should it be? just started veg of 2 plants. it's currently about 12".
ditto the duck beat me lol http://www.marijuanapassion.com//www.pinterest.com/pin/create/extension/I use the back of my hand.
Place hand at canopy level.
Raise light until no heat is felt.