In article .com,
"Charles Middleton" writes:
Are the LED downlighters available yet? How do they compare on
brightness and energy efficiency?

Roughly same efficieny as LV halogens.
However, semi-conductors would be destroyed at typical LV halogen
temperatures, so they're all much lower power, with resulting much
lower light output. To make them look bright, the light is usually
concentrated into a very narrow beam.

I imagine that they can be fitted
into the same fixture - that is they are GU10 spec.

There are 7W compact fluorescents in this format now. In theory,
they should give the same light as a 28W mains lamp, but that's
probably reduced a bit as the tube and reflector combination is
not going to be as effective as with a filament lamp, and they
will be wide angle only.

--
Andrew Gabriel