Keystone 175 W Probe-Start Metal Halide Ballast – 4-Tap Input

Runs one 175 W metal halide (M57/H39) lamp using probe-start technology

Operates on 120 / 208 / 240 / 277 V with 4-tap input for installation flexibility

High power factor (HPF) design for efficient electrical performance

Minimum start temperature: –40 °C, suited for cold-start environments

Compact and durable housing ideal for HID fixtures in parking, street, or area lighting

Backed by a 2-year warranty direct from Keystone