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In 1879, Thomas Edison introduced the first incandescent lamp, using a carbon filament, marking the beginning of a major revolution in lighting technology. Although these early lamps had a short lifespan and low light efficiency, they offered excellent color rendering. The next major advancement came with the halogen lamp, which produced brighter light while consuming about one-third less energy than traditional incandescent bulbs.
The third generation of lighting technology is the metal halide lamp. These lamps are named for the metal halides contained within the bulb. Their basic structure and method of light emission are similar to fluorescent tubes, but instead of relying on phosphor coatings, they use an arc discharge that generates intense heat. This causes the metal halides to vaporize and emit visible light directly, making them more energy-efficient. With an efficiency rating ranging from 60% to 90%, metal halide lamps represent a significant leap forward in lighting technology.
As the third-generation green lighting solution, following incandescent and halogen lamps, metal halide lamps offer high luminous efficiency, excellent color rendering, and a longer service life. They are widely used in high-end applications such as automotive headlights, rear projection TVs, and specialized lighting systems. Beyond consumer electronics, they are also essential in military operations, exploration missions, underwater work, and field rescue efforts.
Compared to standard incandescent lamps, metal halide lamps provide remarkable energy savings and have a large market potential. In Europe and North America, their adoption rate has reached nearly 40%. However, in China, where over 8 billion bulbs were produced last year, the share of metal halide lamps remains below 2%. Additionally, in China, the production of metal halide lamps with power below 50W is still not available due to higher technical challenges and lower demand. As research and development continue, this promising lighting technology is expected to gain more traction in the global market.
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