China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

According to your requirements,electronic ballast frequency, output power, starting frequency, preheat frequency. For example, operating frequency 20KHZ output power of 20W, the start frequency of 30kHz, preheat frequency 100KHZ, high-frequency inductance value about in 3.5-4mH, inductor core needs to open about 1 mm air gap DC saturation current requirements in 1-1.5 a, you can. This is a key device, If the argument is slightly wrong, it will burn the switch, generally calculated values​​, it tested OK, and then determine the final parameters.