There are literally millions on fluorescent tubes in use today, all over Australia.  While there have been advances in fluorescent lamps recently, most light fittings in use still use 36 Watt tubes.  Additionally, fluorescent tubes require a ballast to generate the voltages needed to start the light and these ballasts may use around 12 Watts  each.  So each tube may consume around 48 Watts.

There are a a variety of options manufacturers making LED Tube lights that will fit in existing fluorescent light fittings, however, you will need to get a licensed electrician to modify the fitting as the LED tubes do not requite either the Starter or the Ballast that is required for the fluorescent tubes.

LED Tubes, depending on the manufacturer and light output will generall consume between 15 and 22 watts.  This represents a reduction between 54 to 69% on electricity consumption.  In addition you could expect many years of use from each tube which will reduce ongoing maintenance costs.

Various suppliers can be found on the Internet that can provide more information on the suitabilty of LED Tube lights for your situation.  Just Google LED Lights your region.