Hey JFJ,

1. Either would work fine.

2. Yep 400 hps is great for that space.

3. You're complicating matters mate, you only need one fan, you have the lot attatched to it. I have mine set up like this, tho there are other ways. (i'll use ------ to represent ducting)

Carbon filter-------Cooled reflector--------Fan

see the pic below, you can't see the fan coz thats outside the tent.

4. Sorry i can't say, a lot of it depends on the temp of the air you're sucking into the space.

Good luck
hudson88 Reviewed by hudson88 on . Lighting Question for 2.6'x2.6'x5.3' Growbox I am planning on growing 4 plants in this space. I plan on either using 2 100W CFL's for vegging, or 1 175-250W MH for vegging. I plan to use a 400W HPS for flowering. For my HID lighting I plan on buying an air cooled reflector, and will have a 6" 250cfm fan for exhaust, and a 170cfm inline fan for intake. 1. Would 2 100W CFL's or 1 175-250W MH work well for this space. 2. Would a 400W HPS system work well in this space for flowering. 3. With an air cooled reflector, is it a Rating: 5