Metal halide high-pressure discharge lamp
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorAndreas Genz
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Abstract
A high-pressure metal halide lamp which is particularly suitable for inclon in optical systems is run at specific power between 100 and 180 W per mm arc length. The lamp includes, per cm.sup.3 chamber volume, between 0.3 and 3 .mu.mol dysprosium, hafnium and lithium respectively and between 0.2 and 2 .mu.mol indium, whereby luminance of between 25 and 75 kcd/cm.sup.2 can be generated at color temperature of between 4500 and 7000 K. Light spots with a diameter of about 4 mm and a color reproduction index Ra of 80 are achieved by means of a special reflector. This makes it possible to use the lamp in combination with thin glass-fiber bunches for illumination purpose, e.g. in endoscopy.
Claims8
A metal halide high-pressure discharge lamp (2) having a mean arc power between 100 and 180 W per millimeter of arc length, in particular for incorporation into optical systems (1), having a discharge vessel (9) of high-temperature-proof light-transmissive material, two high-temperature-resistant electrodes (10, 11) and a filling of mercury, at least one noble gas, at least one halogen, and other metals that form metal halides, characterized in that to produce light with a color temperature between 4500 and 7000 K. and light densities between 25 and 75 kcd/cm.sup.2, the fill contains dysprosium, hafnium, lithium and indium as halide-forming metals.
Dependencies are inferred from the claim text.