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

The high-pressure sodium lamp emit a golden white light, with luminous efficiency, less power consumption, long service life, through fog and luring etc. advantages. Widely used in road, highway, airport, dock, dock, station, square, street intersection, industrial and mining enterprises, parks, garden lighting and plant cultivation. High color high-pressure sodium lamp is mainly used in gymnasium, exhibition hall, amusement parks, department stores and hotels and other places lighting. 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 the circuit current rises indefinitely, until the last light or circuit parts and components is flow burned V-I characteristics.

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. Under the condition of constant power, in order to ensure the stable work of lighting, the circuit must be in series with positive resistance characteristics of the circuit components to balance the negative resistance characteristics and stable working current and the elements known as ballast or limit flow for. 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.

Magnetic 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. Inductance 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, power factor is low, so in the network consider a compensation capacitor is connected, in order to improve the power factor of the network. Arc tube operation, high temperature and high pressure sodium vapor corrosion is extremely strong,enerally sodium resistant glass and quartz glass are not competent for. And the translucent polycrystalline alumina ceramic tube arc tube body ideal. It not only has good resistance to high temperature and corrosion behavior of sodium vapor and antibiotics, good visible light through the ability. In addition, single crystal alumina ceramic tube on the performance of high temperature resistance, antibiotics sodium vapor corrosion and transmittance were are superior to those of polycrystalline palpation of the alumina ceramic tube; because the price is expensive, so there are rarely used. An arc tube is the electrode, polycrystalline palpable aluminum ceramic this, cap, solder ring assembly together, adding sodium amalgam into sealing furnace sealing; at the same time filled with a small amount of xenon, in order to improve the startup characteristics of the lighting.

Electrodes with high pure tungsten wire is coiled into a spiral form, in the screw hole is inserted into the core rod, impregnation electron powder, then of the electrode core rod and the niobium tube closed ends are welded into a whole. The polycrystalline alumina ceramic tube (HAT) is made of polycrystalline alumina ceramic powder by mixing powder, fountain spray drying, etc.. High pressure sodium lamp light, electric parameters and arc tube diameter and arc length (distance between the two electrodes) are closely linked,the porcelain lamp holder model is: E27 socket, E40 lamp holder.