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How have artificial lights been improved in the 20th century?

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The search for efficient artificial lighting during the 20th cent. first focused on improving incandescent lamp technology and high-intensity discharge (HID) lamps. The tungsten-halogen lamp, like the other incandescent lamps, uses a tungsten filament as the light source, a gas filling that includes a halogen , and a quartz bulb. The halogens prevent lamp walls from darkening as quickly as those of the other incandescent lamps, so more light is available to the task or work surface.

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