which model?
it looks like the US bulbs are US only (or a lot of north, central and south America, but not all of it)
check out "Input voltage" on the specs page for the ones you want
The US bulbs say 110-130v
looked up an Australian bulb and it says 220-240v, so those won't work on US power.
Things that have a "wall wart" are more likely to work, I have a set of the play bars, and that power supply is 100-240v 50/60 hz, meaning it will work on any electric grid in the world. the prongs do come off, but I don't remember if the other plug options were in the box or not. All of those just seem to say "Mains power 50-60 Hz" with no voltage given in the specs of both the Australian and US versions. If they don't have the right plug, you can get a cheap travel adapter.