LEDwholesalers GYO2004 4-Piece 600 Watt Hydroponic Reflector Grow Light Set Hydroponic reflector grow light set Rated voltage 120 volt /input current 5.30 ampere; works with both high pressure sodium-HPS and metal halide-MH bulbs Frequency 50 hertz/60hertz / power factor &gt; 0.99 Total luminous flux &gt; 75, 000 lumens; frequency (hertz) 25 kilohertz - 100 kilohertz/loss of input watts &lt; 10 percent Harmonic distortion &lt; 10 percent crest factor &lt; 1.7