Not sure what they used, but I remember one night in 2005 in Mt Isa, being delayed an hour for departure, as the lights had failed, and portable lighting had to be set up. I watched the process from the airstairs. The aircraft was an F100, operating an RPT flight. At first it was novel to watch the car make its way down the runway, one by one, side by side, lighting it up. This quickly changed, as the fuel status of the two circling aircraft (a metro and a cessna) became apparent.
That said, maybe the people at OOL thought they could sort it out faster...