It is 220 v in China and 110 v in Canada. For the same 60 w lamps the electric current would be doubled. It needs thicker wiring and bigger switch. I believe many chinese product still would meet the standard here since many product are built for world market. But you can't be sure.
But if there is good price in China and you like them, you could buy them and replace the wiring yourself. I believe it could very simple.