A STUDY OF THE SODIUM-SCANDIUM-LITHIUM IODIDE HID LAMP FILL AND APPLICATION TO 4000-K DESIGN

A detailed study of the effect of chemical fill composition on metal h alide lamp parameters was conducted over a wide range of molar ratios of NaI, ScI3, and LiI components. Optimization of the metal halide add itives and mercury fills resulted in the development of a new family o f low-wattage metal halide lamps with high efficacy, a 4000 K color te mperature, and a general color rendering index of 80. These lamps have a compact size convenient for efficient fixture design, long life wit h good maintenance characteristics, and a pleasing color appearance, s uitable for most outdoor and indoor applications.