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

Fluorescent tubes, diameter finer, starter ignition voltage is higher, the higher technical performance requirements for ballast.
Diameter greater than T8 (including T8) fluorescent tubes, starter ignition voltage is low. Relative to 220V, 50Hz frequency alternating current, consistent starter ignition voltage is less than 1/2 power supply voltage law. Inductive ballast can be used for starter ignition operation.
Diameter less than the T8 fluorescent tube, high voltage ignition starter. Relative to 220V, 50Hz frequency alternating current, does not meet the starter ignition voltage is less than 1/2 power supply voltage law. Inductive ballast can not be used for starter ignition operation. Diameter less than the T8 fluorescent tubes, electronic ballast must match. By an electronic ballast, strik pressure, the fluorescent tube breakdown ignited. Later, by the electronic ballast, fluorescent tubes lit drive operation.
Fluorescent electronic ballast, electronic circuit mode will generally be based on 50Hz or 60Hz power rectified to DC power, and then to self-oscillation mode driver transistor to turn on - turn off generating high frequency switching mode power supply, and an inductor and resonant capacitor in series to produce a high voltage to excite fluorescent starter and has automatic protection circuit, when replacing the lamp or the lamp is damaged, it will automatically stop the transistor action, without generating high voltage in order to avoid danger.