a 400W light is great.

try and lose the cool tube ONLY if temps permit. Cool tubes cut down on UV-B rays which these plants love and you will too as they result in increased potency.
HARDDON Reviewed by HARDDON on . Is my light TOO powerful?? So i have a small, 2' x 2' grow space. But i have the opritunity to get a 400 W HPS cheap (for flowering). obviously it would have to be hung about a foot above the plants....it has a cool tube. Will it be more trouble then its worth? should i just go for a 250. Does anybody have experience using a big light in small area? Rating: 5