What Is The Base Size Of A Standard Light Bulb

Screw in bulbs use a base called an edison screw or es base.

What is the base size of a standard light bulb.

This base was developed by thomas edison for the first light bulbs and is still in use today. 1 888 455 2800 fax 1 508 363 2900. Light bulb socket sizes chart. A19 led filament bulbs in ceiling fan fixture a21 led bulbs in bedroom lamps a19 gold tint led filament bulb in porch light fixture a19 led fireworks bulbs in string lights.

Bulbs with these bases are the most popular of all screw base bulbs. Candelabra a smaller screw in base denoted most often with an e12. Here is the light bulb socket size chart to help you determine what size do you need your light bulb to be. 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.

A19 bulbs are the most common light bulb shape so this is what you ll see the most. A further explanation of the light bulb base sizes you can look at the letter number references e12 e17 and e26 to help understand a bulbs base style and size. It may not matter most of the time but in some games. The number that follows the a designation indicates the nominal major diameter of the bulb either in one eighth.

An important detail that you need to know about the lamp is that it is a21 which refers to the shape and size. The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters. The most common light bulb base types are. What are the different light bulb bases.

Standard medium a regular sized screw in base usually denoted with an e26 or e27. 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. Shoppers of led light bulbs often confuse the specifications for base type e26 or e27 and bulb shape a19. It has a pear like shape and is typically fitted to either an edison screw or a bayonet cap base.

Bulbs with these base types can be used interchangeably as there is only a 1 millimeter difference in base size. Standard arbitrary a bulbs are the most widely used and thought of when it comes to household lighting. From top left to bottom right. The standard household lamp is a19 with a diameter of 2 375 inches and a21 2 625 inches.