Electronic Ballast for Metal Halide Lamp: . Microprocessor controlled. . Low operating temperature extends ballast life by 30%. . Works with all MH Bulbs or HPS Bulbs. Consistent lamp color, uniform lumen output, reduced lamp flicker . . Automatic protection function: Over loading, over current, short circuit. . High power factor: 0.99. . Size: 21.1*10.2*6.8(cm) Length*Width*Height . OEM ODM welcome.