GE Ballasts, 2 lamp, 120 volt, ballast factor .87:
2 lamp F34T12 magnetic ballast: system watts 93*
2 lamp F34T12 electronic ballast: system watts 63
2 lamp F32T8 electronic ballast: system watts 49
Source: GE Lamp & Ballast Catalog
*Note: no longer made. Also an educated guess based on current of .77 A * 120V = 92.4 watts.