the real question is............how many FTers does it take to change a lightbulb?

Most electrical lamp stuff for usa market is built 110-220 ac/dc, with the 110 not being exactaly 110, and the 220 not being exactally 220. if it indicates it is 220, it will run on 220 or 240v ac with no problem. the only components in most lamps are a switch, a socket, a plug, and a few pieces of wire. you should be able to find the voltage limit on the socket, switch and plug.

the biggest problem that one would encounter with wire is exceeding the current (amperage) limitation. that occurs when going to lower voltage, and increasing the amperage.as in taking a 100 watt 240 volt lamp and running it at 12 volts 100 watts.

in the usa, there are other completely ....... voltages between 250 and 440. they are usually only in commercial buildings, that combine various forms of 3 phase.

i do not know about socket/bulb compatibilities.