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Gas discharge lamps offer long life and high light efficiency, but are more complicated to manufacture, and they require electronics to provide the correct current flow through the gas. Similarly, Neon Sign s may use either direct ilumination or (to obtain certain colors), indirect phosphor excitation. Gas discharge lamps have Color Rendering Indexes below 100. In some cases such as the orange low-pressure sodium lamps that are well known as street lighting, the color rendering is so bad that entirely different colors appear the same. This low color rendering index limits the use of gas discharge lamps in homes, shops and restaurants, although with careful design one can mix incandescent and gas discharge lamps to good effect. Another common type of gas-discharge lamp is the Xenon Flash Lamp , now commonly found in film and digital cameras, even in single-use cameras. More robust versions can produce short intense flashes repeatedly, allowing the stoboscopic examination of repetitive motion (useful in certain balancing applications. These were at one time popular for theatre and dance party uses, "freezing" the motion of the actors or dancers. This type of lamp was also used to demonstrate persistance of vision, where an entire room would be iluminated by multiple lamps behind difusing wall panels (Experiments in Arts and Technology, ca. 1973 {Link without Title} ). In this otherwise darkened room a periodic flash would cause every detail of the occupants to be imaged on the observer's retina, completely frozen in motion. High intensity gas discharge lamps are now employed as automobile headlamps, and although favorable to the driver their intense blue light can be uncomfortable to other drivers. This can be somewhat ameliorated by highly accurate beam shaping to reduce stray illumination. SEE ALSO |
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