Water-Cooled High-Pressure Mercury-Discharge Lamp for Direct-Current Operation
A water-cooled high-pressure mercury-vapor lamp operated on direct current which has been used for motion picture projection is described. When mounted in a suitable reflector, it is a powerful light source for high-speed photographic applications. The lamp has a bore of somewhat less than 2 mm and an arc length of 12 1/2 mm. It can be operated continuously at 1000 watts and has a brightness of about 320,000 candles per square inch along the axis of the arc. With the reflector described, an area 5 inches in diameter can be illuminated to 50,000 foot-candles with one lamp unit. With a lamp of double length consuming 2 kilowatts, the illumination level may be increased considerably.
- Print ISSN
- 0097-5834
- Published
- 1949-11
- Content type
- Original Research
- DOI
- 10.5594/J11700
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