Thanks for the input. The MH bulb was a bit old and i was using it for flowering. The good news is that i just got a 400 hps for flowering. As it turns out, the 400hps is quite a bit hotter than the 400MH.

I think the 400HPS was the right choice for my setup.

Thanks!
dgsgandalf Reviewed by dgsgandalf on . Too much light/heat? Hi guys. I am currently running a 400w MH in my 2'x3'x5' box with a vented hood and a fan pulling air out of the box/room. I am planning on buying a 600w HPS instead of the MH because the MH just isn't putting out enough light. My question is this: with 2 1/2 - 3 foot tall SOG flowering clones, is a 600w HPS going to be too much for my box? Is there such thing as too much light (lumens/square ft)? How much more heat will a 600w HPS produce than a 400w MH? Thanks! Rating: 5