How to identify E11
- Look for E11 on the lamp or package.
- Measure across the threaded shell.
- Check voltage and temperature rating separately.
Where it is commonly used
Common use is a clue, not proof. The fixture label and model documentation take priority over a visual match.
Bulb shapes sold with this base
You may see these shapes with a E11 base. The base code does not guarantee the bulb width, length, beam angle, or clearance.
Before you buy a replacement
- Do not force E11 into E12.
- Compact halogen fixtures can have high heat loads.
- LED replacements must fit the original enclosure.
Quick answers
Questions about the E11 bulb base
What is a E11 bulb base?
E11 is an 11 mm Edison screw base. It is smaller than E12 and is not interchangeable with a candelabra socket.
What size is a E11 bulb base?
E11 has a nominal 11 mm diameter. Measure straight across the threaded metal base. Use the printed base code when available because a visual estimate is not conclusive.
Where is a E11 bulb base commonly used?
Common examples include compact halogen fixtures, decorative lamps, display lighting, specialty luminaires. Fixture type is only a clue; confirm the code on the bulb, socket, fixture label, or manufacturer documentation.
Can I choose a E11 replacement by appearance alone?
No. Match the E11 connection first, then verify voltage, actual input wattage, bulb dimensions, fixture restrictions, controls, and any enclosure or location rating required by the installation.