use about 18" or less of space above your veg side, for a compartment for a carbon srubber setup and or a remote ballast, if you intend to go hid
cactusman23 Reviewed by cactusman23 on . Grow box design, opinions/suggestions needed This is my first actual grow box, although I have grown before, It was in a space in which I did not need a box. Anyway Im just looking for opinions and suggestions on ways to improve it. Rating: 5