E26E27
E26E27 is a term encountered in the lighting industry and on consumer listings to indicate compatibility with both E26 and E27 Edison screw bases. It is not an official standard, but a marketing shorthand used by manufacturers to describe products designed to work in multiple regional socket types or with adapters.
Background on the bases: E26 and E27 refer to the screw base diameter of the bulb. E26,
How E26E27 products are used: In applications where a single product must serve multiple regions, manufacturers
Limitations and safety: Compatibility does not guarantee safe operation if voltage, wattage, or dimming requirements do
See also: Edison screw, E26 base, E27 base, lighting adapters, dual-base bulbs.