How would you describe this gadget in English?
In Hebrew, I would say "בית מנורה עם מתג", that is, "a lantern house with a switch"- perhaps English has a better way to put it.
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
The object in the photo is a kind of fluorescent light. It is a a narrow tube (diameter ~1/2 cm) twisted helically to fit in the same space as a incandescent bulb that fits in a lamp socket. Traditional fluorescent lights are much longer and thicker and usually linear or one circle of 8" diameter.
These 'twisted' small fluorescent bulbs are referred to as
'compact fluorescent bulb'
presumably because they are so much more compact than traditional fluorescent bulbs (🎩 @Barmar).
As to the thing the bulb is screwed into (a bulb socket that plugs into an electrical socket), there is no one obvious single technical term for it. It is called by many names, which describe all the pieces. 'plug in light socket', 'light socket adapter', 'outlet to socket adapter', etc and 'with switch'.
'Plug' is the word used for electrical prongs to be inserted into the wall for electricity. 'Socket' is the holes in the wall that you plug the prongs into or the receptacle that you screw the light bulb into.
Notably, however, the bulbs are colloquially referred to as
bulbs because their twisted appearance resembles the tight curl of a pigs tail.
It looks like a right-angle adapter with switch that takes a European-style receptacle to an E27 230VAC lamp socket.
Personally, I've never seen one of these made to North American standard (flat blades to an E26 Edison base).
I can find the Euro style ones on Chinese websites though. They call it a "plug adapter" with some added SEO terms sprinkled in there. Also a few that appear to be made to Japanese or Taiwan standards (which are compatible with North American, but not identical).
The bulb is typically called a "CCFL" or, more redundantly, a "CCFL lamp" (Cold Cathode Fluorescent Lamp (lamp)).