HIGH-EFFICIENCY AND ENERGY SAVING CERAMIC METAL HALIDE LAMP

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A ceramic metal halide (CMH) lamp (400) is designed to operate at a lower-than-nominal lamp voltage (340) when driven by a conventionally HPS ballast (480), thereby substantially reducing (335) the lamp power consumption (350). The lower-than-nominal lamp voltage (340) is achieved by providing an appropriate combination of lamp design parameters, such as mercury and salt doses, arc length, and so on. The lamp (400) includes a high aspect ratio (between 4 : 1 and 6 : 1) discharge chamber (420) with a wall loading higher than 38 W/cm2. The high aspect ratio provides for a narrower arc width, and improved optical performance than a lower aspect ratio discharge chamber in standard HPS fixtures, and requires less mercury. The ionizable salt includes sodium iodide at over 50 mol% and rare earth iodides below 6 mol% to reduce arc bending and color separation, and to obtain high luminance efficacy and eliminate the need for protective sleeves about the discharge vessel.