Light Bulbs

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wikipedia - Edison screw types

There are four commonly used thread size groups for mains supply lamps:

  • Candelabra: E12 North America, E11 in Europe
  • Intermediate: E17 North America, E14 (Small ES, SES) in Europe
  • Medium or standard: E26 (MES) in North America, E27 (ES) in Europe
  • Mogul: E39 North America, E40 (Goliath ES) in Europe.

Bulb Shapes and Sizes

The code number of a bulb consists of a letter or letters followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. The mosts commonly used household bulb is the A-19. The bulb is “A” type and the diameter would be 23/8”. A 65BR40 is a 65 watt reflector 5” in diameter.

MapAWatt bulb sizes

MapAWatt bulb sizes

Bulborama lighting reference guide



bulborama-base-sizes bulb socket guide

A Bulb By Any Other Name…

C7 Bulbs have a candelabra or E12 base. This size bulb is typically used for chandelier-type fixtures and decorative lighting.

C9 Bulbs have an intermediate or E17 base. These are historically known as the old Christmas light bulb size.

Medium Bulbs have a E26 base (E27 in Europe). This is the same size as a standard household bulb.

ceiling fan by fireplace

A15 e12 candelabra bulb

e12 candelabra screw type a15

A Arbitrary (standard) – universal use for home lighting

wikipedia - Edison screw types

  • Candelabra: E12 North America
ceiling fan by fireplace
        bulb type: a15
        base type: e12 - candelabra screw - 12mm diameter