|Don's Home Home & Garden Light Bulbs Size - Shape Nomenclature|
Light bulbs | light bulb shape & socket/base types | LED Lights | CFLs|
Lighting lamps and light bulbs are described by a shape, diameter, length and screw type designation. This normally is in the form of letter(s) followed by a number followed by an optional letter.
Fluorescent tube bulbs
Sockets and base type:
E10, E11, E12, E14, E17, E26 (Standard Bulb), E27, E36, E39, BA15, SC, GU10, GU24, G4, G5.3, GY6.35, GU8 GY8, G9, G12 LED light bulb sockets and bases are manufactured to the same standards as halogen, incandescent and other traditional lights. Edison Screw-in (ES) Candelabra: E12 (diameter of 12 mm) [0.47"] Intermediate: E17 (diameter of 17 mm) [0.67"] Medium or Standard: E26 (diameter of 26 mm [1.02"] Mogul: E39 (diameter of 39 mm) [1.54"] More at Galan.com EnergyStar categorizes bulbs as: Omnidirectional: A, BT, P, PS, S and T Decorative: B, BA, C, CA, DC, F, G Directional: R, BR, ER, MR and PAR See: LED Light Bulb Base Types | EagleLight.com and LED Light Bulb Base Types | gallan.ccA - Arbitrary shaped bulbs (standard household bulbs)
BR (for bulged reflector) bulbs are lamps with "wide flood" beam angles, which means that they provide more than a 45 degree angle when lighting an area.
Multi Faceted Reflector (MR) Halogen and LED
Beam Angle (spot/flood)
Candelabra bulbs are sometimes listed as B and BA and C. Bases are typically E12.
Edison screw - Wikipedia
LED Light Bulb Shapes and Sizes
Lightopedia.com - Lamp size reference
Light Bulb Shapes and Sizes | LED Lamps Education | LED Lighting
Light Bulbs | Incandescent Shapes | BulbAmerica.com
LED Lighting | BulbAmerica.com
Halogen Lamps - MR11 and MR16 - Focused Ellipsoidal Dichroic Reflectors | ILT
S-6 Shape Bulb Identification - YouTube
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