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The light from white LED lamps and LED strip lights is usually provided by industry standard surface-mounted device LEDs (SMD LEDs). [2] Non-SMD types of LED lighting also exist, such as COB (chip on board) and MCOB (multi-COB). Surface-mounted device LED modules are described by the dimensions of the LED package. A single multicolor module may ...
Efficiency: LEDs emit more lumens per watt than incandescent light bulbs. [66] The efficiency of LED lighting fixtures is not affected by shape and size, unlike fluorescent light bulbs or tubes. Size: LEDs can be very small (smaller than 2 mm 2 [67]) and are easily attached to printed circuit boards.
Light bulbs using coiled coil filaments are sometimes referred to as 'double-coil bulbs'. For a 60-watt 120-volt lamp, the uncoiled length of the tungsten filament is usually 580 millimetres (22.8 in), [77] and the filament diameter is 0.046 millimetres (0.0018 in). The advantage of the coiled coil is that evaporation of the tungsten filament ...
G – Glass bulb, ST-12 to ST-16 size; GT ... 3, 5, 8, 9 for the base. [4] ... (the E80F is commonly sought after as a high quality replacement for the similar EF86 ...
Most CFLs contain 3–5 mg per bulb, with the bulbs labeled "eco-friendly" containing as little as 1 mg. [81] [82] Because mercury is poisonous, even these small amounts are a concern for landfills and waste incinerators where the mercury from lamps may be released and contribute to air and water pollution.
The enclosed filament operates at around 2,500 K (2,230 °C; 4,040 °F), producing more shorter-wavelength radiation than open wire-coil sources. Developed in the 1950s at General Electric, these lamps produce about 100 watts per inch (4 W/mm) and can be combined to radiate 500 watts per square foot (5,400 W/m 2).
These sockets and plugs are four prong (see receptacle chart above) grounding devices (hot–hot–neutral–ground) available in ratings from 15 to 60 A. The voltage rating is 250 V. Of the straight-blade NEMA 14 devices, only 14-50 and 14-30 are in common use and either may be used for home charging of electric vehicles .
Jacob Perkins patents a design for a practical refrigerator using dimethyl ether. [13] 1852 Lord Kelvin describes the theory underlying heat pumps. [14] 1855–1857 Peter von Rittinger develops and builds the first heat pump. [15] 1877
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