Abstract
Beginning with a discussion of historical light sources (lime lights, arc lamps with condensers and mirrors; low- and high-intensity carbon-arc lamps), the development of gas discharge lamps, which came out after 1930, were suitable only for black-and-white film projection. The xenon lamp, which appeared on the market in 1954, could project both color and black-and-white films and therefore replace the open burning carbon light arc successfully. Thousands of theaters are now equipped with xenon lamps. The electrical capacity of xenon bulbs, which was only 900 W in 1954, has been increased to 6,500 W.
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