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

An electrical ballast is a device intended to limit the amount of current in an electric circuit. A familiar and widely used example is the Electromagnetic Ballast used in fluorescent lamps, to limit the current through the tube, which would otherwise rise to destructive levels due to the tube's negative resistance characteristic.

 

Electromagnetic Ballast is another wound coil similar to choke but used for an entirely different function. Fluorescent lamps, mercury vapour lamps, sodium vapour lamps, iodine lamps, neon sign lamps for publicity etc need a high voltage for starting and once started, the running voltage assumes a value much lower than the mains voltage. The Ballast provides the high voltage for starting.