(4) NANOLUX 1000W Xtreme Dimmable Digital Grow Light Ballasts + Bulbs | NN1000D Run ballast at 100%, 75%, or 50% Soft start and dimming feature Strike both Metal Halide &amp; High Pressure Sodium Bulbs Multi-voltage - runs 110v, 120v, 207v, 208v, 220v, and 240v Runs 20% cooler than other digital ballasts on the market