The Natural Philosopher wrote:
Andrew Gabriel wrote:
In article .com,
writes:
Are there any commercialy-available low voltage lights which run cool?
Anything other than LEDs?

There are low voltage fluorescents.
You haven't given enough info for any detailed reply.
LEDs you are likely to find used in most lighting are
similar efficiency to filament lamps.

Actually they are about ten times as efficient..

Nope.
Take a 500W halogen floodlight - it produces around 10000 lumens, or
20lm/W.

I'll pay you a hundred pounds for a one watt LED (to be delivered in a
couple of weeks max) that outputs 200lm.

The 'state of the art' with dodgy assumptions is around 50lm/W.