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.
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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 halogen, compact 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.
7 comments
This light bulb base chart is an incredibly helpful resource for anyone navigating the world of lighting! I appreciate how clearly you’ve laid out the different base types and their applications, as it can often be confusing for consumers. The visual aids make it easy to understand which bulbs fit where, which is essential for both DIY projects and professional installations. It’s also interesting to see how various base types relate to the overall efficiency and performance of lighting systems.
I’m curious, are there any emerging trends in light bulb technology or base designs that homeowners should be aware of when planning electrical upgrades in their homes? It would be great to hear your thoughts on how these innovations might impact lighting choices in the future!
Looking for screw in lightbulbs 8mm base colored green or blue
Are there different light bulb base lengths? I’m replacing my candelabra base bulbs and the new one’s, the base is a little longer, and it sticks out a little bit. And it wiggles some even though it’s screwed all the way in. Thanks
I need to replace a tiny light bulb Type E8 .9W Where can I find one in the US Thank you
Hi, I need replacement bulbs for Satco, Halogen excel 39w, 120v, E15China, 530 Lumens.
I hope you can help!