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

Double fluorescent lamp with glow starting device in the circuit and the ballast series. Glow starting device is a glass bubble. Glass cannon with a U-shaped metal piece of glass tube filled with neon. Connect the power when the neon glow discharge. To generate heat, double metal sheet is heated expansion. Double metal sheet and another contact. Because when the contact resistance is very small. Neon glow discharge. The double metal sheet temperature decreased. With the contact separation. Then the circuit disconnected. Ballast due to inductance effect induced by high voltage. In order to disconnect the radio equipment to produce the electric magnetic interference in the glow starting device is connected in parallel with a capacitor.

When the lamp is bright, the interior is equivalent to a conductor, so that the voltage across the fluorescent starter is not sufficient to emit a glow. Is equivalent to the lamp and the ballast series connected in the circuit, where the ballast continues to play a limited role, the normal operation of the circuit. As the electric energy consumption of the old inductive ballast is too large and the efficiency is too low, it has gradually been replaced by the electronic ballast with high efficiency. Electronic ballast for high frequency switch state, without the need to start start starter, luminescence in gas breakdown directly inside the tube, so energy saving ballast: AC DC, DC variable AC - the frequency becomes higher. With the public 50Hz will cause the stroboscopic phenomenon, if it is 5000, the effect is not to feel.