On Wed, 18 Nov 2015 22:20:56 -0800 (PST), Uncle Monster
wrote:

On Wednesday, November 18, 2015 at 10:44:07 PM UTC-6, Keith wrote:
replying to Jeff Wisnia, Keith wrote:
jwisnia wrote:

Wikipedia says that they are the same, it just depends on which side of
the pond you're on:
http://en.wikipedia.org/wiki/Incande...b#Screw_thread
Jeff

An E27 socket is probably rated for at least 220VAC that many countries
use and certainly would be adequate for the 110VAC in the US. E26 sockets
are rated for the lower 110VAC US standard. The diameters of the bulb
sockets are 26 and 27 millimeters (for E26 and E27) which are "close
enough for government work" (i.e. interchangeable).
--

That's not the experience me and my brother had working on housing units that were built in Australia. American made light bulbs were so tight in the light sockets that we put some Noalox on the threads to get them to screw in. o_O

[8~{} Uncle Bulb Monster
That strikes me as rather strange, since American bulbs are E26
(small) and Euro bulbs are E27 (large). I could see you having trouble
putting E27 Euro 240 bulbs into American E26 sockets - THAT would make
sense. And those "american" bulbs would be 120 volts too.
An e26 bulb in an E27 socket should go in like butter - but once
tightened the threads could ride up a bit, making them a bit ornery
about coming back out.