Base Sizes Different Light Bulb Bases

Light bulb bases also known as caps are the part that connects the bulb to the light fitting and they come in several shapes and sizes that can often be confusing to begin with.

Base sizes different light bulb bases.

Types of light bulbs bases most a shaped lamps have a screw base e12 e17 or e26. The type of bulb you need to choose will depend on the types of fittings you have in your home and buying a bulb with an incompatible cap or base for your fittings will render the bulb useless. The numbers refer to base width in millimeters. In north america and europe these light bulb base types are the most common and widely used.

The size of the bulb base appears right next to the base style on the packaging in the form of a number. 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. 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. Each base type has a descriptive term such as medium intermediate candelabra etc and they re defined by the letter e edison followed by numbers.

Your lamp or fixture s socket will dictate which cap or base a light bulb needs in order to fit but there are a number of different base types and sizes to choose from and it s not always easy to determine which type is right for your fixture. To add to the confusion different fixtures often feature different types of sockets. The exception is the gu24 base with a double base that requires a type of twist and lock installation. If you do not see the base type you are looking for give us a call at 800 784 1998 and we can help you locate the correct bulb.

Click on any of the illustrations to view a list of bulbs with that light bulb base. Therefore a light bulb described as a gu 10 base will feature a 10 millimeter wide base. The size of a bulb base is determined by measuring the width of the base in millimeters at its widest point. They are available with gx5 3 gu4 and gu10 base types.