What a strange operating voltage for the lamp!!

Well, given power = voltage x current, we know 85 = 82 x current, which means current = 85/82, which is 1.037, or slightly over 1 Amp, so you really want a power supply (or step-down transformer) capable of sourcing more than that. Something like this 2.2A one http://www.jaycar.com.au/productView...n&form=KEYWORD would be ample...

Other than that, you would need a sparky to do some extensive rewiring so you could use the Australian mains power directly, with an easily available lamp. If you were planning to use the enlarger forever, that might be a more prudent investment in the long term - i.e., when you can't find an 82v halogen lamp...

Cheaper still would be another enlarger, but that may require some patience

Marc!