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I say go for the 400w setup. If i were you though, i would have a separate intake and exaust ventilation for the bulb. You can find what they refer to as a "cool tube" where you can hook ventilation ducting from an intake fan right onto your cool tube (that your bulb is in) and then send the heated exhaust out of the box thru the exhaust ducting. I saw a compete 400w lighting kit at sunlightsheds.com for like around $200 which is pretty good i think.
The complete kit includes:
1.) 400w Digital Ballast
2.) 6" Inline Air Cooled Reflector
3.) 400W Metal HalidE Bulb
4.) 400W High Pressure Sodium Bulb
5.) Light Mover Pulleys (Two)
6.) 115 CFM Air Cooling Fan
7.) Heavy Duty Timer
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