120 volt and 240 volt will be ultimately the same price to run - you get billed by kilowatts. Which is more convenient for you and which is the room wired for?

Digital ballasts and conversion bulbs - no idea, but I personally stay away from digital for now, as they seem to be very hard on bulbs. I also don't use conversion bulbs, I run dual spectrum throughout

GH or AN - your choice. Both have proven excellent results. Which is easier to get?

The DWC club should be able to point you in the right direction for the other ???s
Tokudai Reviewed by Tokudai on . 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