The E27 accessory is the best known. The E means the light source has a swivel fitting: the 27mm long thread allows the light source to rotate in the lamp.
The E27 accessory is the best known. The E means the light source has a swivel fitting: the 27mm long thread allows the light source to rotate in the lamp. There are many incandescent, halogen and energy saving lamps with an E27 connector.