unless you live in year round cold weather or have a big space to grow in, i would always stick with the seal-off air-cooled type reflector. other wise your just blowing hot air around. you wanna evacuate that hot air, outside the grow area.
Thats not true whichever reflector you get An exaust fan and passive intakes is adequete to take all the hot air out, even with an aircooled hood without A/C your growroom will stay the same temprature as the outside.

Also it brings in new air from the bottom which the air cooled hood doesn't (correct me if I'm wrong).
cornish_dope Reviewed by cornish_dope on . Looking to buy an HPS system, need advice Hey I am thinking about buying an hps system but am not totally sure which one would be the best fit for my plants. Would a 400 watt system be sufficient for 4-8 plants? So far I am considering Hydroempire, Organic Hydroponic Nutrients, Indoor Grow Lights and Supplies - 400 Watt HPS & MH Advantage Mini System - $279.95$239.95 or finding one on ebay. I would like to keep the price as low as possible but the idea of getting a system that would be able to use an hps or mh bulb is pretty Rating: 5