Light bulb base standards
Select a base type for exact dimensions, regional usage, interchangeability rules, and safety notes.
Screw bases (Edison-type)
- E26 — standard US household screw base
- E27 — standard EU household screw base
- E12 — candelabra screw base (US)
- E14 — small Edison screw base (EU)
Pin and bayonet bases
- GU10 — twist-lock spotlight base
- G9 — loop pin capsule base
- GU24 — twist-lock CFL base
- MR16 — bi-pin spotlight base
- G4 — miniature bi-pin base
- B22 — bayonet cap base