Some questions on 600W setup

[GaGrown]

What's an average CFM needed for cooling one or two 600W hoods?

With 1 600 watter,I used a 265 cfm fan. Now with 4 600's I use a 265 inlet and a 265 and 465 exhaust. Really need to have 2 465's.I have 4 Pro Ultra lite hoods.Great hoods and very versatile with not alot of headspace.

Ga Grown!

GaGrown Reviewed by GaGrown on 04-09-2007. Some questions on 600W setup A few questions: 1. Looking for opinions or options on a 600W digital, dual voltage ballast. SS Galaxy looks good. If you had the choice, would you run 120 or 240? 2. The galaxy 600W ballast is compatible with these bulbs. Is one notably better than the others? (In other words, which one would you buy?): Grolux, Plantastar, Philips C600, Eye LU, GE, SolarMax, SunMaster SL, SolarMax MH conversion lamps, SunMaster MH conversion lamps, Gavita. 3. GH or AN 3-part? Rating: 5