There are different types of xenon undercabinet lights on the market. There are those that will just clip into a wire and those that are fixtures. If you have purchased the lights already, you can check out the specification sheet on the website of the manufacturer for details, or call customer service.

If you haven't decided on the fixture yet, you may want to check out some websites of manufacturers for the different types of xenon lights. Check out Sea Gull Lighting, Nora Lighting, Lightolier, Juno Lighting, WAC Lighting to name just a few that deal in this.

If you decide to go with just the wire where the lamp holders clip on, you can usually have the option of putting up a track to hold the wire.

The only caution that I have given to people is to make sure that the lamps won't be seen in your counter top. This happens quite often when it is not considered. If you have a dark shiny top, everything that you put under the counter will usually reflect.

ilitem, how can one ensure that the lights won't be seen on the countertop..is it by placing the lights nearer the wall?

Hi,
A wire is run to the switch from the transformer location, to which a hot feed is run, as well as the low voltage supply lines to the U/C locations. When the switch is flipped, power is fed to the trans, which in turn feeds 12v to the fixture lines.
Just how the wires are run for your fixtures depends on what you use, and where you want them. I prefer the lights at the front edge of the cabinet bottom, myself.
Casey

Looking at the Kichler Linear lighting, do you Have to use a transformer? don't they make transformer & Light switch combos, this way you could wire into the the switch. I see lutron has dimmers and some specify for low voltage.