At the campertrailers.org website was a tip for creating a 12 volt camping light. To make the light we bought the following items:
Arlec Light - $9.80 (Bunnings)

Nelson ELV 12 volt Fluorescent Lamp - $10.00 (Bunnings)

Cigarette Adapter - $3.95 (Jaycar)

We removed the 240v plug from the Arlec Light and replaced it with the Cigarette Adapter. The connections were silver soldered and the cigartette adapter was then reassembled. The Nelson ELV 12 volt lamp was then fitted.
The light was then plugged into a 12v socket and tested. We were pleasantly surprised with the brightness of the light.
For less than $25 we now have a good 12 volt light for the Camper Trailer.
Arlec Light - $9.80 (Bunnings)

Nelson ELV 12 volt Fluorescent Lamp - $10.00 (Bunnings)

Cigarette Adapter - $3.95 (Jaycar)

We removed the 240v plug from the Arlec Light and replaced it with the Cigarette Adapter. The connections were silver soldered and the cigartette adapter was then reassembled. The Nelson ELV 12 volt lamp was then fitted.
The light was then plugged into a 12v socket and tested. We were pleasantly surprised with the brightness of the light.
For less than $25 we now have a good 12 volt light for the Camper Trailer.