Ok mind you this is all "theory" but I did some math here and please correct me if Im wrong.

This is the chiller I used for the math.
http://www.drsfostersmith.com/Produc...&N=2004+113768

Ok 2.63 Amps and 5.0 Amps for example. How many 150watt MH would it take to equal that much power.

150x 2 = 300/110 = 2.72 (So 2 already eat more than the lowest grade chiller)

150x4 = 600/110 = 5.4545 Amps (so 4 eat more than their next size chiller)

So a room with a bunch of halides as a prop tank would not really make much sense compared to trying to grow outside right?