Well Kelvin's is suppose to be readily avaiable for students blah blah blah, so that would be your best bet imo.

But also, hiring out a portrable studio lighting kit to take out doors will be more fun and creative. Could be more technical though :S, plus you'd need to charge the battery as it doesn't last a very long time. PR Agencies or Camera Electronics in Northbridge should have these available for hire I think.

Or another cost effective idea would be to hire out a couple of normal studio lights. $90 for a weekend usually, power them up at home and shoot away in the garage or driveway. Actually thats a bloody good idea