Hydrofarm Quantum QT400 Dimmable Ballast 400W 400 W
- Run at 100%, 75% or 50% power (400 W runs at 100% and 75%).
- Strikes both metal halide and high pressure sodium bulbs.
- Accepts 120V/240V with no wiring needed (both cords included).
- 208V-configurable with electrician assistance.
- NOTE: The Quantum II series ballasts are designed to operate single-ended lamps only, and cannot run double-ended (DE) lamps.