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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.
The light bulb commonly used since the early 20th century for general-purpose lighting applications, with a pear-like shape and an Edison screw base, is referred to as an "A-series light bulb." This most common general purpose bulb type would be classed as "A19/E26" or the metric version "A60/E27".
230/240-volt incandescent light bulb with E27 screw base. Edison screw (ES) is a standard lightbulb socket for electric light bulbs. It was developed by Thomas Edison (1847–1931), patented in 1881, [1] and was licensed in 1909 under General Electric's Mazda trademark.
⌀35 mm (~⌀11/8 in) candle-flame shape, ⌀12 mm Edison screw Flood light: BR95 E26: BR30 E26 ⌀95 mm (~⌀30/8 in) flood light, ⌀26 mm Edison screw Halogen track-light bulb: MR50 GU5.3: MR16 GU5.3 ⌀50 mm (~⌀16/8 in) multifaceted reflector, 5.33 mm-spaced 12 V bi-pin connector
Many lamp units, or light bulbs, are specified in standardized shape codes and socket names. Incandescent bulbs and their retrofit replacements are often specified as "A19/A60 E26/E27", a common size for those kinds of light bulbs. In this example, the "A" parameters describe the bulb size and shape within the A-series light bulb while the "E ...
The bulb socket in the center has a larger diameter (an E39 or E40 mogul base) than a regular E26 or E27 Edison screw light socket, and is typically made of cast porcelain for the higher temperatures.
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