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Metal halide lamps are concerned with the high luminous efficiency, small size and wide. the lamp holder is cheap.This paper tries to introduce a brief introduction to the metal halide lamp.

Metal halide lamps are filled with a small amount of metal halide and gas, from the trigger to the normal light need to be more than a minute, roughly divided into three stages:

1, trigger phase. Metal halide lamp without filament, only two electrodes, directly coupled with the working voltage can not be ignited, it is necessary to add high pressure to make the light gas ionization. High voltage is generated by a special trigger

2 ,ignition phase. The bulb is triggered, discharge voltage further heating electrodes, a glow discharge, and create conditions for the arc discharge

3, normal light emitting stage. Under the glow discharge, electrode temperature is more and more high, the electron quantity emitted more and more, rapid transition to the arc discharge. With the increase in temperature and light emitting more and more tonic to normal, the whole process needs more than a minute, if start current, power good starting performance, this process can be the luminescence mechanism of the shorter metal halide lamp.

Metal halide lamp mainly depends on the metal halide as luminescent material, metal halide in the solid form of light inside. Therefore, a small amount of hydrogen ignited gas or xenon lamp must be filled, so that light bulb. After the lamp is lit, the first work in the state of low pressure arc discharge lamp, bipolar voltage is very low at this time, about 18 ~ 20V, the light output is small, then the main production of heat, so that the whole body heating lamp, metal halide lamp is introduced with the increase of temperature to evaporate, a metal halide vapor, the heat convection effect, continue to flow the arc center, part of the metal halide arc was 5500 ~ 6000K high temperature decomposition, a metal atom and the halogen atom, under the action of the electric field, the metal atoms are excited; the other part is arc metal halide high temperature decomposition, high temperature and electric field in the dual role, directly stimulate the formation of molecular luminescence due to various metal halide different evaporating temperature,

Therefore, these particles are involved in evaporation light, so there are different atomic spectra have emerged, with the temperature gradually increased, the metal atom density arc gradually increased, resonance absorption, atomic spectrum disappears, and extended to long wavelength, because the lamp temperature can be further improved and the heat balance, so all the metal halide evaporation, molecular spectroscopy appears, color and brightness are stable, light pressure up to tens of atmospheres, lights inside the arc by low voltage arc discharge into high-voltage arc discharge lamp, voltage from 18 ~ 20V to rise and gradually stabilized to about 100V, in normal light lamp dimensions, luminous efficiency and light process structure and metal containing three kinds of metal halide lamp, the advantages and disadvantages.

The biggest advantage of metal halide lamp is that the luminous efficiency is particularly high, the luminous efficiency is as high as 80 ~ 90Lm/W, while the normal luminescence is less, so it is a cold light source. Due to the spectra of the metal halide lamp is superposed on the continuous spectrum based on the dense linear spectrum. Therefore, it is significant especially high color rendering index, color reproduction is particularly good, up to 90%. In addition, the metal halide lamp color temperature is high, up to 5000 ~ 6000K, a special projector lamp can reach 7000 ~ 8000K. Under the condition of the same brightness, higher the temperature, the eyes feel more bright metal halide lamps due to high brightness, small volume, so relatively short-lived, due to the limitations of materials and technology, at present domestic metal halide lamp life is still lower than 1000 hours. Another disadvantage of the imports of the metal halide lamp life of up to thousands of hours of the metal halide lamp is difficult to start, must use special ignitor. After starting the brightness of the system is gradually increased, if the starting energy is too large, the starting speed is too fast, will affect the lamp life, in circuit design should be fully considered.