Standard Household Light Bulb Base Size

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.

Standard household light bulb base size.

The letter or letters in a bulb code indicate either shape or special features such as reflector type. 1 888 455 2800 fax 1 508 363 2900. The candelabra e12 has a diameter of 12 millimeters. Screw bases come in several sizes and they are referred to by both a descriptive name and size.

These are known as light bulb codes. Common bulbs with e26 e27 bases. Medium standard base code. Browse our extensive selection of standard light bulbs and find the right size brightness and color for your needs.

Bulbs with a base that looks like a medium base but isn t are made to defeat bulb thieves in public places. Unlike the light bulb shapes the number in the light bulb base measures the light bulb base diameter in millimeters. Most common light bulb uses including lamps recessed flush mount flood lights are going to have one of the first three base types shown above. Almost all household bulbs have a medium screw base sometimes called an edison screw 1 16 inches in diameter with 7 threads per inch.

Household light bulbs bases. They are commonly used for general lighting in standard light fixtures such as ceiling lights lamps can lights outdoor spotlight and flood light fixtures and vanity lights. The number that follows the a designation indicates the nominal major diameter of the bulb either in one eighth. 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.

Most light bulbs screw into a socket. It has a pear like shape and is typically fitted to either an edison screw or a bayonet cap base. Fluorescent pin bases miniature bipin medium bipin single pin recessed double contact 4 pin single ended 4 pin 2gx 13 axial twist lock bases 10mm gu10 10mm gx10 24mm gu24 bi pin bases 4mm g4 4mm gu4 4mm gz4 5 3mm g5 3 5mm g5 5 3mm gu5 3 5 3mm gx5 3 5 3mm gy5 3 6 35mm g6 35 6 35mm gy6 35 6 35mm gz6 35 8mm gy8 8 5mm g8 5 9mm g9 9mm g9 pin. Bulbs with these base types are available in many different styles.

Pin type bases are normally used for track lighting landscape bulbs. Every light bulb has identifying characteristics that are represented by a letter or series of letters and a number. Look at your fixture to determine its base type.