The e26 is rated at 120 volts.
E26 vs e27 bulb base.
The european variant the e27 is rated at 240 volts.
E39 north america e40 goliath es in europe.
The e27 is the european variant and is rated at 220 volts.
In general bulbs with an e27 designation are safe to use in e26 lampholders but e26 bulbs may pose an electrical safety hazard when used in e27 lampholders and 240v ac.
However an e26 bulb can fit in e27 base and an e27 bulb can fit in e26 base without problem.
If you have a 240 volt incandescent vintage bulb you are able to use them in the us where the voltage is 120.
E26 e17 e12 from left to right.
So for an e26 bulb the diameter of the base is 26 mm while the e27 has a base diameter of 27 mm.
The e26 is the standard 120 volt american base.
Those two standards are interchangeable meaning a us e26 will fit a european e27 base and e27 will fit in a e26 base.
Photo of the relative internal sizes of the sockets.
Socket e26 stands for 26mm and the e27 for 27 mm in diameter.
E26 is 26 mm and the e27 is 27 mm diameter.
The only difference is the voltage light bulbs that are 120 240volt.
You may see low cost led bulbs using an e27 base on ebay and amazon from foreign suppliers.
Samples of bulbs with these bases.
Those two standards are interchangeable meaning a us e26 will fit a european e27 base and e27 will fit in an e26 base.
The same size as a standard a19 bulb.
Thus a e26 has a 26 mm base diameter.
The only difference is the voltage.
The number following the e indicates the size in mm of the external thread screw.
E26 stands for 26mm and the e27 for 27 mm in diameter.
This is because e26 bulb bases are assumed to only receive voltages up to 120v ac and not 240v ac.