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

High pressure sodium lamp discharge material vapor pressure is very high, namely high atomic density of sodium, sodium atoms and electron collision between the number of frequent, the resonance radiation broadening of spectral lines and other visible spectrum of radiation, so the high-pressure sodium lamp light color is better than that of low pressure sodium lamp. High pressure sodium lamp is a kind of high intensity gas discharge lamp. Due to the negative resistance characteristics of gas discharge lamps, if the lighting alone received the power grid, the working state is unstable, with the discharge process continues, it will lead to circuit current rises indefinitely, until the last light or circuit parts and components is flow burning high pressure sodium lamp and other gas discharge bulb, work is arc discharge state, V-I characteristic curve to the negative slope, i.e. lighting current rise, and the voltage applied to a bulb dropped.

In order to ensure the stable operation of the light bulb, a circuit must be connected in series with a circuit without a positive stop to balance the negative resistance. Resistors, capacitors, inductors, etc., are willing to be limited to flow. Resistive ballast has the advantages of small size, price cheap, and high pressure sodium lamp supporting use will occur is difficult to start, work resistance produces a high heat, have larger space for heat dissipation and consumption power is very big, it will make the circuit lighting efficiency decreased. It is generally used in the DC circuit, the use of a hundred AC circuit in the light of the phenomenon of obvious. Capacitive ballast although not as resistive ballast its consumption power, temperature rise is low, in the low frequency power supply, charging the capacitor, pulse peak current, cause great harm to the electrode, lights flashing, affect the service life of the lamp bulb; work in high frequency circuit, voltage fluctuation can reach the ideal state, become an ideal ballast.

Magnetic ballast loss is small, stable impedance, the impedance bacteria primality small deviation, long service life, stable lighting than resistive ballast good, current and high pressure sodium lamp supporting use of ballast are inductive ballast. Its disadvantages are higher than benzene and high prices. In addition, electronic ballast has begun to appear, at present the price expensive, reliability is not and the high-voltage sodium lamp is matched, except for special occasions, under normal circumstances are rarely used. Therefore, high pressure sodium lamp and lamp ballast series must be corresponding specifications before use. High pressure sodium lamp lighting circuit is a nonlinear circuit, the power factor is low, so in the network consider a compensation capacitor is connected to improve the power factor of the network