Scrubbing would be indicative of no venting. Scrubbing is where you are recirculating the air in your grow space through a carbon filter to clean or "scrub" it to remove odor. My closet pictured is scrubbed because i really have nowhere to vent. Keep in mind when scrubbing your fan will actually create heat. Thats what i meant by total wattage in my closet. It will help to distribute the heat in the form of convection but it is another source of energy=heat.
Ah, my bad... still learning all the lingo.
I will be drawing air through my carbon filter located inside the grow closet, and venting to the external room. I'm basically converting half a closet into a stealth grow room. The venting will go into a room beside, and I'll be insulating the ducting to minimize noise in that other room. It will be drawing in from the room the closet is in. If I draw from the floor, I'm drawing in air at about 15C. If I draw from the ceiling, I'll get approximately 17C. I got enough ducting to do whatever.
If I used HPS/MH, I'm thinking that ambient room temp is going to be low enough to keep the temp down, but I'm not confident. I can't afford the space or $$ for an A/C unit inside the grow room, which is why I flip to LED.
At least with LED, I can add a small heater if I need(cheap, and can be combined with a tiny fan), so I can give JUST enough heat, and no more... while maintaining the minimum CFM to maximize the odor removal on the carbon filter.
$200 gets me 3 CXM22's, and a dimmable driver.
I could get a 400W HPS/MH for $125(bulbs, fixture, batwing reflector, fan cooled ballast and rachet hangers). Even if Apollo isn't great, it's enough to do the job for my first few grows.
I could probably be fairly confident if I went with a vented hood... but I'd be spending another $50 and personally would rather just kick the extra $25 to get the LED. ($125 + $50 for venting hood... +$25 fk it... LED time
)
If I was confident that heat wouldn't be a factor (both in the grow room, and the exhaust room/rest of the house), I wouldn't spend the extra $75.... because I can't really figure this issue out, I've been convinced to spend an extra $50 over my budget, and take an ass kickin from the wife...