Good question!

Hmm, if I had to guess I would say if you have ample height btwn tops and hood to work with, and you mylar/reflect your closest then it wouldnt make a difference. If you had a room that exceeded the area which the light from the hood lit up, then it would make a difference.

Thats my educated guess. Hope thats clear.
Cheers!
thebullfrog Reviewed by thebullfrog on . Need fast answer on hood, online or local store? OK guys I have some babies that I need to get under a 1000w pretty quick and I am about to get a air cooled hood today. If I order off line I can get a 20.4 in x 24 in hood, but if I go to the local hydro store I can get a approx 20 x 20 hydro farm air-cooled hood. Will the measurements make a huge difference in a 4 x 4 grow space? Rating: 5