What are the common lamp bases? Here’s the answer.
: In the UK, the 4 most common are: • Bayonet Cap, or BC, often shown as a B22 (26 MM across the pins) • Small Bayonet Cap, or SBC, (B15, 17 MM across the pins) • Edison Screw (ES, number E27, 27 MM across the base) • Small Edison Screw (SES, number E14, 17 MM across the base)
The small E14 and B14 lamps are popular with modern lamp fittings and chandeliers, because the fittings can be smaller and lend themselves toward slimmer, more elegant designs. It can be confusing though. See the graphics on the right.