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

Magnetic ballast use a coil wrapped around a metal core, essentially an electromagnet, to generate an inductive field that affects the voltage flowing through the coil wire. Because they work at a lower cycle than electronic ballasts, you may notice a flicker or hear a hum coming from fixtures containing electromagnetic ballasts.

Ballasts are required for many kinds of lamps which build up resistance the longer they are lighted. These lamps, including fluorescent lamps and HID lamps, would continue to draw more and more current the longer they are lit. Eventually the bulb overheats and could possibly explode.

For a lighting device based on electric gas discharge to work, the ionization of gas in the tube is necessary. This phenomenon takes place at a relatively high potential difference and/or temperature than the normal operating conditions of the lamp. After the arc is set up, the conditions can be brought down to normal. To achieve this,