The metal halide lamp was used for the outdoor lightings, and the facilities lightings such as factories and gyms and came so far. Recently, with the view point of saving energy and environmental issue, the higher efficient and longer life light source is demanded from the market. In this paper, we report the high efficacy and long life metal halide lamps which were developed by adopting the ceramic arctube, studying the arc-tube design, and selecting new doses.
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