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A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.
Under-cabinet light – mounted below kitchen wall cabinets. Display Case or Showcase light – shows merchandise on display within an enclosed case such as jewelry, grocery stores, and chain stores. Ceiling fan – may sometimes have a light, often referred to as a light kit mounted to it. Ceiling fans with built-in lights may eliminate the ...
In the 1970s, Thorn Lighting introduced an energy-saving 8 ft retrofit tube in Europe. Designed to run on the existing 125 W (240 V) series ballast but with a different gas fill and operating voltage, the tube operated at only 100 W. Increased efficiency meant that the tube produced only 9% lumen reduction for a 20% power reduction. [ 7 ]
Fluorescent tubes are long, low-luminance sources compared with high intensity discharge lamps, incandescent and halogen lamps and high power LEDs. However, low luminous intensity of the emitting surface is useful because it reduces glare. Lamp fixture design must control light from a long tube instead of a compact globe.
The operating temperature of LED tubes is lower as compared to traditional lighting technologies, and a LED tube produces less heat than traditional fluorescent lamps. Among the most important properties of LED tubes is the possibility of light direction – the entire luminous power of a LED tube can be directed in a narrower beam to wherever ...
The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light. [1] [2] It was widely used starting in the 1870s for street and large building lighting until it was superseded by the incandescent light in the early 20th century. [1]