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What Light Bulb Sizes Stand For. A for Standard Household/Arbitrary. C for Candle. R for Reflector. MR for Multifaceted Reflector or Quartz Reflector Lamp. PAR for Parabolic Aluminized Reflector.
Other sizes with a data sheet in IEC 60064 are A50, A55, A67, A68, A71, A75, and A80. Another common A-series light bulb type is the A15 bulb which is commonly used in the US for appliances and ceiling fans. The A15 bulb is 15 ⁄ 8 in (1 + 7 ⁄ 8 in; 48 mm) wide at its widest point and 3.39 inches tall.
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
In the United States and Canada, lamps are typically identified by a code such as FxxTyy, where F is for fluorescent, and the first number (xx) indicates either the power in watts for bi-pin lamps, length in inches for single-pin and high-output lamps, and for circular bulbs, the diameter of the circular bulb.
IKEA has recycling bins for compact fluorescent lamps (CFLs), energy-saving bulbs, and batteries. In 2001, IKEA was one of the first companies to operate its own cross-border goods trains through several countries in Europe. [210]
Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts. They require no external regulating equipment , have low manufacturing costs , and work equally well on either alternating current or direct current .