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Features: UL and ETL Listed Fits for HPS or MH Grow Light System High power and low noise Fully compatible for metal halide and high pressure sodium bulbs Stabilize input power and output luminous flux Reduce wastage and improve usable efficiency of power supply equipment capability 1000W HPS MH Digital Electronic Dimmable Ballast UL and ETL Listed Specifications: Rated Power: 1000 watts Overall Size: 15-1/2"L x 4-3/8"W x 2-3/4"H (w/ Cooling Fan) Power Factor: >99% Total Harmonic Distortion(THD): 99% Total Harmonic Distortion(THD):