Keystone Probe-Start 250 W Metal Halide Ballast – 4-Tap Input

Operates a single 250 W metal halide (M58/H37) lamp using probe-start ignition

4-tap input options: 120, 208, 240, 277 V for integration with diverse power systems

High power factor (HPF) design for efficient performance in HID systems

Minimum start temperature rating: –40 °C, suited for cold-climate or outdoor installs

Compact housing (approx. 4.3" × 3.62" × 4.8") for flexibility in fixture mounting

Backed by a 2-year warranty via Keystone