E-26 Base Bulbs
E-26 Medium Base Light and Lamp Bulbs
The term E-26 refers to a light bulb's cap or base - the bulb component that allows for both electrical and mechanical contact. The letter "E" in E26 refers to Edison Screw, the most standard of lamp bases, while the numerical "26" refers to its diameter in millimeters (approximately 1 inch). E26 is also commonly referred to as a Medium Edison Screw (MES).