Fulham Brand WorkHorse 5 Electronic Ballast, 277 Volt, with Leads.  Ballast Lamp Starting Mode:  Instant Start.

WH5-120-L Fluorescent Ballast Ignites:

• Circline:  One 20W - 40W, Two 20W - 40W
• T5 Circline:  One 40W, Two 22W - 40W, Three 22W
• T5 HO:  One F39HO  - F80 HO, Two F24HO - F54HO, Three F24HO - F39HO, Four F24HO
• T8 Linear:  One F14, Two F13 - F18, Two F30, Two F58 - F70, Three F13 - F40, Four F15 - F32
• T8 HO:  One F48HO - F72HO, Two F48HO - F60HO, Three F72HO
• T10 Linear:  One F40, Two F40
• T12 Linear:  One F14, One F20 - F96, Two F14 - F96, Three F15, Four F15
• T12HO:  One F18HO - F96HO
• Twin:  One 24W - 27W, Two 13W, Two 50W - 55W, Three 13W - 40W, Four 5W, 13W - 18W
• Flat Quad:  One 18W - 36W, One 96W, Two 18W - 36W, Three 18W - 24W
• Quad:  Two 26W, Three/Four 18W - 26W
• Triple:  One 32W - 42W, Two/Three 26W - 42W, Four 18W - 26W 
• 2-D:  One 38W - 55W, Two 28W - 38W, Three 21W - 28W, Four 16W - 28W