The A-series light bulb is the "classic" glass light bulb shape that has been the most commonly used type for general lighting service (GLS) applications since the early 20th century. It has a pear-like shape and is typically fitted to either an Edison screw or a bayonet cap base. The number that follows the "A" designation indicates the nominal major diameter of the bulb, either in one-eighth inch units in North America[1][2][3] or in millimeters in the rest of the world.[4][5][6]
Although A-shape bulbs historically used incandescent lighting technology, A-shaped compact fluorescent (CFL) and LED lamps are also commonly available.
- ^ "Lamp Size and Comparison Features" (PDF). WW Grainger Inc.
Lamp size (maximum lamp diameter) is expressed by a number representing eighths of an inch.
- ^ "LED University: Light Bulb Shapes and Sizes Explained". EagleLight.
'A' type bulb shapes are standard house hold light bulbs. The number after the bulb shape is the number of eighths of an inch in diameter. For non-imperial measured bulbs the number following the bulb shape is the number of centimeters [sic] at the widest point of the bulb. Standard bulb sizes include A19 in the United States and A60 for a slightly smaller metric measured bulb.
- ^ Cite error: The named reference
Superiorwas invoked but never defined (see the help page). - ^ Glass bulb designation system for lamps. Technical report IEC/TR 60887:2010, Edition 3.0, International Electrotechnical Commission, 2010-06.
- ^ "IS 14897 (2000): Glass Bulb Designation System for Lamps - Guide". Retrieved 21 March 2017.
A bulb shape having a spherical and [sic; end?] section that is joined to the neck by a radius [...] A60: An "A" shape bulb with a nominal major diameter of 60 mm.
- ^ "LED Start GLS: 40, 60, 75 & 90w equivalents" (PDF). GE Lightling. Archived from the original (PDF) on 2017-03-21. Retrieved 2017-03-22.