I have been using the Icecap electronic ballast. I have the model 660 and it will power a 4 tubes in any combination, VHO/HO/FL. I have used mine with a mixture of T12s & T8s and it works fine. You can even mix VHO/HO/FL. Call Champion Lighting @ 800-673-7822. \\\|/// \\ - - // ( @ @ ) /--oOOo-(_)-oOOo--------------\ | Allen Sandifer | | ibi007 at mail_connect.more.net| | ST.Louis, MO | \----------Oooo---------------/ oooO ( ) ( ) ) / \ ( (_/ \_}