You can sprout under 400 watts easy.
I poped a bunch of seeds with a 1000 watt MH once(I'll never do it again) I got way more males then ussual.
Jdog7000 Reviewed by Jdog7000 on . Can I sprout seeds under my 400 watt MH? I'm curious because if I can, it would be wonderfully convenient for me. I have a bit of room to play with and can move the seeds as far as 7 feet away in order to diminish their exposure to the MH. My closet ranges in temperature from 78 to 80 degress with the MH running. Any thoughts would be appreciated. :) Rating: 5