Multi-volt Instant Start T8 Ballast will accept up to 4 or 3 F32T8 lamps Low profile housing and lightweight for portability Instant start electronic ballast for long lamp starting cycles and low initial cost Anti-striation circuitry helps to eliminate and prevent the spiraling effect from lights Mounting dimensions: 8.9-Inch L x 1.1-Inch W, Mounting slot set 0.3-Inch apart