Abstract
A metal halide lamp having a three-band spectrum has been developed which overcomes those obstacles which have hitherto prevented a successful design: (1) the necessity of a relatively high condensate without overloading the fused silica arc tube; (2) undesirable impurities inherent in halides; (3) the requirement of an electrode which maintains a stable discharge. The development effort has resulted in a lamp which features a contoured arc tube, a tailored set of exhaust procedures and integrated rod/coil electrode which is essential to lamp stability. Efficacies of 60LPW have been achieved with a CPI which exceeds that of a 2800 K incandescent source. The color contrast threshold (CCT) of this lamp is 3600K and the color is very stable.
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