Development and design of ceramic metal halide lamps

1. overview

After 20 years of development, ceramic metal halide lamp technology has matured, the quality reached perfection. Practice has proved that the ceramic metal halide lamp is a high performance commercial lighting light source, the light efficiency (110 ~ 120lm/W) and life (12000 hours) can match with the high voltage sodium lamp, and the color index is up to 90 or more than 95, close to the level of the halogen lamp and incandescent lamp. Due to the absence of sodium leakage, the color temperature can be reduced to 3000K or less, similar to that of incandescent lamps and halogen lamps. Its color temperature and light color consistency is good, the drift is small, far from quartz, metal halide lamp than. A series of excellent performances of ceramic metal halide lamps make it widely used in almost all lighting fields. With mature production technology, production increased, prices also began to decrease, popular is the global development, many Lamp Companies and technical personnel all want to have a try, but many investors in the start after the discovery is not as expected, the product quality is difficult to control the rate of finished products, low cost recovery difficult, not quit, stop the.

Ceramic metal halide lamp is a kind of high technology products, light material, lamp, lamp manufacturing equipment, arc tube structure design, operation skills and all other aspects of good ceramic metal halide lamp does not have very important meaning, any part of a careless omission will fail on the verge of success.

Snow Light Company from 2005 began to prepare, invested huge sums of money, to the end of 2007 R & D success, high-quality products, transfer production. Before and after spending three years and huge amounts of money, the quality of this product has reached the highest level, including many lessons learned.

2. ceramic foam shell is the key to product quality

Ceramic metal halide lamp and metal halide lamps are the only difference is the quartz arc tube shell which replace the translucent ceramics (also called alumina) bubble shell, of course with the lamp manufacturing will be completely changed after the ceramic bulb. The adoption of the ceramic foam shell makes the temperature of the arc tube shell increase by about 300K, the temperature of the cold end of the shell is greatly increased, and the metal halide in the lamp is more fully evaporated, so the light effect and the color rendering property are greatly improved. Composition, suitable sintering process alumina ceramic is a very stable material, and there is no sodium leakage, so it can be made of ceramic metal halide lamp, low color temperature (<3000K) and the color shift is very small, life is very long.

3. the principle of ceramic metal halide lamp

Metal halide lamps (metal halide lamps) rely mainly on metal halides as luminous materials. Metal halides exist in solid form. Therefore, the lamp must be filled with a small amount of ignition gas, hydrogen or xenon, so as to ignite the bulb. The lamp is ignited, 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 evaporating, become metal halide vapor in the heat convection effect under constant flow to the arc center, part of the metal halide arc was 5500 ~ 6000K high temperature decomposition into metal atoms and halogen atoms, under the effect of the field, the metal atoms are excited; another part of the metal halide cannot be decomposed by electric arc of high temperature, high temperature and electric field in the dual role, directly stimulate the formation of molecular light.

Because of various kinds of metal halide evaporation temperature is different, 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 in arc increases, resonance absorption, atomic spectrum gradually subsided, and extended to long wavelength, because the lamp temperature further improved and the establishment of 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, the voltage across the lamp by 18 ~ 20V rise and gradually stabilized to about 100V, in normal light state.