I had a friend who is an aircraft mechanic at Moorabbin airport. He got me a pair of these long before I had a 4X4.
I fitted them to my girlfriends(now SWMBO) Ford Escort which had a 35 amp alternator, and these lights draw 20 amp each! Now back in those days the biggest alternator available was 55 amp, but there was a conversion available to suit the 55 Bosch which took it to 80 or 85 amps so this took care of it.
When the engine was at idle and the lights were turned on the RPM would drop about 200 from the alternator load, much like a bigger engine used to when the air con was turned on.
These things generated so much heat that from about 250mm distance I almost got a piece of paper to ignite. It started to smoke and blacken but would not light.
The light output in its day was AWESOME.
Dave.

