This is what i was looking for:
http://www.exposurelights.com/exposure_spec.htm

The efficiency claims are rather unclear - they're claiming it's a
5watt LED that gives equivalent light to a 32 watt halogen. Then go
on to say that they're only twice as efficient as halogen. Now 5
watts is 5 watts which suggests that they're a)heavily overvolting it
or b) the electronics that drive it are very inefficient and another
10watts is soaked up there.