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, about 26 millimeters, is the common household base in North America and specifies a typical 120-volt system. E27, around 27 millimeters, is standard in Europe and many other regions with 220–240-volt supplies. The two bases share a similar screw thread design, which allows for some cross-compatibility in practice, though voltage and fixture specifications differ.

How E26E27 products are used: In applications where a single product must serve multiple regions, manufacturers may offer bulbs or adapters labeled as E26E27. This can take the form of dual-base bulbs that physically fit either socket or adapters that convert one base to another. Some “E26/E27” items are designed to operate within a universal or multi-volt range, such as LEDs rated for 110–240V, reducing the risk of incompatible voltage. Consumers should verify both the socket type and the voltage rating before installation.

Limitations and safety: Compatibility does not guarantee safe operation if voltage, wattage, or dimming requirements do not match regional standards. Using a bulb with the wrong voltage or exceeding the fixture’s rating can cause damage or hazards. When in doubt, consult the fixture’s labeling or a lighting professional, and prefer products explicitly rated for the intended territory.

See also: Edison screw, E26 base, E27 base, lighting adapters, dual-base bulbs.