What Size Is My Light Bulb Base

Use this handy guide to identify different types of light bulb bases that apply to incandescent halogen high intensity discharge fluorescent and led light bulbs.

What size is my light bulb base. Numbers in a bulb code indicate size in millimeters or eighths of an inch. If you do not see the base type you are looking for give us a call at 800 784 1998 and we can. Basic types are those with screw bases consisting of aluminum brass or ceramic. An a19 light bulb is 19 eighths of an inch or 19 8 in diameter.

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. The letter or letters in a bulb code indicate either shape or special features such as reflector type. The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters. Or pin types such as bayonet or bi pin.

The e in the light bulb size refers to edison the inventor of the screw base light bulb and screw base light bulbs are sometimes called edison light bulbs candelabra bases are mostly used in smaller decorative incandescent cfl and ccfl light bulbs. These are known as light bulb codes. 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. It is found on smaller light bulb.

If you need to identify a certain type of light bulb we have charts for bulb shapes sizes screw types series and base sizes to help you identify which light bulb you need. It is important to determine if the type you intend to purchase matches the type taken by your light fixture. To determine a light bulb size use the full size scale shown calibrated in eighths. 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.

Place edge of the light bulb to be identified on the top end of the scale and measure the approximate diameter by reading the measurement at the opposite edge of the light bulb. Light bulb bases come in several different types. The intermediate e17 base is not very common. Click on any of the illustrations to view a list of bulbs with that light bulb base.

1 888 455 2800 fax 1 508 363 2900. Bulbs with these base types can be used interchangeably as there is only a 1 millimeter difference in base size. The a means arbitrary shape and the 19 means size in diameter 19 8th inches or 2 3 8th inches.