Reduction of energy consumption for lighting has received more and more attention as a global effort to preserve our natural resources. In past years, high efficiency pulse-start quartz metal halide (QMH) lamps have gained momentum and have been applied in many new installations. However, over 80 percent of systems installed in the North American (NA) market are probe-start ballasts. The technologically advanced ceramic discharge metal halide (CDM) lamp has emerged in the market having excellent color properties and improved lumen maintenance compared to QMH lamps while limited to operation on pulse-start metal halide ballasts. Furthermore, the existing QMH and CDM lamps are designed to operate at nominal power on these systems, therefore no energy savings can be realized in existing installations. In realizing the future, this paper describes new energy saving medium wattage CDM lamps that can directly retrofit on either probe-start or pulse-start ballasts. The lamps, which operate at 205 watts and 330 watts respectively on 250/400 watt ballasts, can save 18 percent in energy while providing the equivalent mean luminous flux, superior lumen maintenance, greater service life, and enhanced color properties compared to the existing QMH lamps. By utilizing the latest advancements in ceramic arc tube design, the energy saving CDM retrofit lamps can reliability start on probe-start ballasts. Furthermore, the lamps have universal orientation in open fixtures and long life. With significant energy savings and improved lamp features, the energy saving CDM lamps are ideal for existing and new lighting applications.
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