adjustable short arc HID lamp with constant color during dimming

摘要

A HID lamp dimmable quartz short arc comprising an arc tube with at least one tungsten electrode in which the arc tube comprises a chemical mixture comprising iodides and / or bromides of Sodium, Scandium, Holmium (Na-Sc -h) and has an aspect ratio of = 1.1, 5 wherein the chemical mix is ​​in the range of 0.75-2% by weight of Hox3, 45-85 wt% NaX, 1 , 5-5.5 wt% SCX3, where X can be Br or I, thereby achieving correlated color temperature (CCT) in the range of 3000-3500 K, and in which the lamp is configured to maintain the correlated color temperature (CCT) with a constant Y coordinate color over a control range below about 78% of the nominal power.