Around here, Home Depot carries Advance and Lowes carries Sylvania. I have only used the Sylvania so far. The 2x32 electronic will run either 2x 28,32, or 36w bulbs. It will run one 55/65w bulb. The 4x32 will run either 4 of the smaller bulbs, 2x55/65w or 1x96w. The 2x59 will run 2x55/65w or, I think, 1x96w. The Sylvania ballasts are called Quicktronics. My understanding is that these ballasts are very similar to the Fulham Workhorse series. I wonder if they'll light a VHO
also? Kinda doubt it, but I'm gonna wire one up one day just to see if it will.