Light Bulb Base Chart

Types of Light Bulb Bases

Find the  light bulb you need using this visual light bulb base chart and detailed illustrations of general light bulb bases, fluorescent bases and specialty halogen base types.

Click Here to Save and Print

Light Bulb base Chart

What is the Difference between Light Bulb Bases?

There are tens of unique bases for light bulbs. The most familiar is the Edison screw base found on most incandescent bulbs and many  halogencompact fluorescent, HID and now LED bulbs.

The common terms are medium, intermediate, candelabra and mogul. However, because the light industry likes mysterious codes, you may also see E26, E12, E39, etc. E obviously is for Edison. The number after the E is the diameter of the base in millimeters (mm).

Here are the most common Edison base names, codes and applications:

Name Code Diameter (mm) Applications
Mogul E39 39 mm
Medium E26 26 mm Common Household Bulbs
Intermediate E17 17 mm Appliances. Old Christmas Lights
Candelabra E12 12 mm Chandeliers. Ceiling Fans.
Mini Candelabra E11 11 mm
Miniature E10 10 mm
Midget E5 5 mm

The large Mogul bases found on higher wattage incandescent and HID bulbs are E39.

Most Edison base bulbs are called "single contact" because there is one contact button at the center of the base. 

Back to blog



Great informative article. Looking for some LED E12 bulbs can you help me?


Leave a comment

Let us Illuminate your World™