To use a Dual Voltage Electric LED Bulb E26 in a E27 or B22 environment?
So I bought a Universal LED Bulb that emulates Circadian Rhythm for lighting to help manage my sleep cycles, locally (wherever I am) as well as when traveling.
Most of my time is spent between:
- US (Currently ordered & Shipped E26) &
- India (mostly B22 around and newer installations have E27)
- Some other nations now & then (not long enough to order there)
- I have a local India store bought (Similar to pic below) B22 to E26/E27 converter I've used before)
- Wont work with new E26 bulb; appeared it would, but did so for E27.
- On checking, previous china made bulb model was E27 bought via Amazon US
When I googled why, this was the answer that popped up -
Can A Bulb With An E26 Base Fit In An E27 Socket?
The answer is sometimes. Sometimes an E26 base will fit into an E27 socket, while other times an E26 base will have one extra tread, preventing it from reaching the bottom of the socket and forming a connection.
Question: How do I make it work in India or any E27 / B22 locations ?
- Find a converter that does B22 to E26 and a E27 to E26 also (Hard find?)
- Small DIY hack on converter that manipulates / fixes around this E26/E27 difference?
Updated Data: "Standard" bulb base: E26 or E27? Both? https://www.homeownershub.com/maintenance/standard-bulb-base-e26-or-e27-both-266061-.htm
- E26 (US) are one millimeter shorter and may not make contact with the base. No contact, no light.
- Longer, E27 bulbs will make contact in the shorter base. I have had the same experience.
- All my USA purchased lamps worked great in Europe.
- None of my European lamps or ceiling lights worked in the USA without bulb base adaptors.
- It has been so long since I purchased them I can't tell you where to go.
The difference of the lamp socket E26 and E27
The threads are the same but I believe E27 is a longer base, meaning a European bulb would fit an American socket but the reverse might not be true.
I seem to remember a German customer of one of my former employers who brought several lamps over from Germany, and had no problem getting American bulbs to fit.
They are the same diameter and thread size. The only difference is that the E26 is 26mm long and the E27 is 27.5mm long.
E26 or E27 Edison Screw?
There is only a 1mm difference between the threads of E26 and E27, so they are virtually identical. Still, it's important to buy the correct bulb certified for use in your country. This is because each country and region of the world, have different certifications. B22 bulbs are also available. They are not as popular, and generally used in the UK, Australia, and India.
An easy reference of what Bulb type is used in major markets is as follows:
United States - E26 Edison Screw
Canada - E26 Edison Screw
Japan, Korea & Taiwan - E26 Edison Screw
Australia - E27 Edison Screw (or B22 Bayonet Cap)
Europe - E27 Edison Screw
United Kingdom - E27 Edison Screw (or B22 Bayonet Cap)
- For legal, and cost based reasons, the only bulbs we sell/ship to the United States are E26 connector bulbs.
- E27 bulbs are only available to ship to countries where they are certified. We do not ship, under any circumstances, E27 bulbs to the United States.
"Bulbs have a universal power supply. They will work with electric grid power from 100-240V 50/60Hz"
"The following countries use E27 bulbs: