>>14052082It means that 60w is its nominal output at 230v (or whatever voltage they have in your third world country). It is designed to work with these parameters and will last promised amount of hours, wont overheat etc.
If you change the voltage or current, it may glow brighter or dimmer or not glow at all depending on what kind of a lamp it is, what electronics are inside etc.
This is not science though, and i say it as a person with several articles published in ieee
