What is What is this Hydralec Ind Regulated Power Supply HLPS-220 ?

I reckon it might be a home made jobbie as Hybralec make domestic and industrial low voltage lighting.

They use to import them according to some caravan forums. see here:

http://caravanersforum.com/viewtopic.php?f=2&t=4159&start=0

.........."Nine years ago Hybralec industries supplied me with a "smart charger" to replace a three stage charger that they supplied to the vans builder. The original charger performed in a satisfactory manner up until when it failed. The replacement turned out to be just a fixed voltage power supply. The only smart bit about it was the cooling fan speed varied in sympathy with the output current. When faced with what their charger really was it did not last long in their catalogue."

Sounds interesting.

Andrew