I installed a set of track lights
converted to work with led bulbs.
The bulbs replace an MR16 lamp, and are 12 volt.
I had to pull the mini transformer(the fixture was originally 120V) out of the track light
head, and in it's place I wired an on/off switch.
I used a piece of track that was left over from a reno job, and cut it to fit.
It takes patience to cut the track and not screw anything up, but still and all, it only took me about 3 hours to do the job.