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PGU20-4 1 12 V: 24 W ANSI № 5200 PH24WY 1 12 V: 24 W Amber PS24W PG20-3 1 12 V: 24 W ANSI № 5202 PSX24W PG20-4? 1 12 V: 24 W ANSI № 2504 Similar to PS24W, but with slightly different luminous flux tolerance PSY24W PG20-4 1 12 V: 24 W Amber, ANSI № 2503 PW24W WP3.3×14.5-3 1 12 V: 24 W ANSI № 7447 PWR24W WP3.3×14.5-6 1 12 V: 24 W Red ...
Original 4–13 W miniature fluorescent range from 1950s or earlier. [1] Two newer ranges, high-efficiency (HE) 14–35 W, and high-output (HO) 24–80 W, introduced in the 1990s. [2] Panasonic's range of FHL fluorescent tubes in 18W, 27W, and 36W varieties for the Japanese market. Circular fluorescent tubes.
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), [76] and the filament diameter is 0.046 millimetres (0.0018 in). The advantage of the coiled coil is that evaporation of the tungsten filament ...
Also within the bulb were metal sculptures coated with phosphors. These phosphors fluoresced when excited by glow discharge. Because glow discharge occurs readily at 110-120 volts AC, one could use these bulbs in standard household lamps in the United States. The phosphors used in the bulbs were somewhat brittle, necessitating care in handling.
The lamps use a tube that is curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the base of the lamp. Compared to general-service incandescent lamps giving the same amount of visible light , CFLs use one-fifth to one-third the electric power, and last eight to fifteen times longer.
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