In article op.wang0kfqytk5n5@i7-940,
"Lieutenant Scott" writes:

Do you mean low voltage? I've not seen the point in low voltage lighting at all, all you're doing is adding the requirement for a transformer and more wiring.

12V halogens are at least twice as efficient as mains halogens.
Also, the smaller light source (filament) means you can design
the optics to direct the beam exactly where you want it much
more accurately, so there's a much wider range of beam angles
available, and less light spillage (wastage) where it's not
wanted. (LEDs can be even better in this respect.)

--
Andrew Gabriel
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