I've seen suggestions between 3x3' -> 4x4' for a 600w HPS. So I will probably make it 3x4' (so i can actually reach in far enough)

For height, 6' tall... 8" for the pots, 32" for the plants, 12" for the lamp, and 20" headroom.
vannewb Reviewed by vannewb on . What's the right size cabinet for a 600w hps? I'm going to make a basic square cabinet. - 600w HPS hanging from the top. - temperature activated fan to cool - Black & White poly on all the surfaces. - 6" square pots (each 1 gallon) with soil - standard grow nutrient, but no co2. How big should the cabinet be? Rating: 5