He seems to use top-grade materials everyplace else, so I'll assume that these, too, are the lighting of choice for some reason or another.

If I can add a question to your post please, I'd also like to know if it's preferred that the under cabinet Xenons are on a dimmer, or is that necessary?

Xenon fixtures are a newer product than halogen and the bulbs are advertised to operate at lower temperatures than halogen, but they still produce a lot of heat relative to fluorescents.

I recently installed xenon fixtures inside glass-front cabinets and they are way too hot. (Lighting store recommended them.) After talking with the fixture manufacturer, who does not recommend them for an enclosed space, looks like I will have to replace them with fluorescent or another type of low-heat, low wattage fixtures, before I set something on fire!

So, you will be fine with xenon undercabinet fixtures, unless you want to avoid adding a significant heat source in your kitchen. Otherwise, you should go with fluorescent for good task lighting on your counters.

I'm going to go xenon, as the bulbs seem to light a little more of the surface area of the backsplash and counter top, and my continued research still claims they are slightly less 'toasty' than halogens.

lavenderblues: we're putting ours on dimmers, as ours will be hardwired and I like the 'soft' effect of dimming the under cabinet lights for ambiance.

Here's a design note I found on xenons:

We used Xenon line voltage under cabinet fixtures from Pegasus Lighting. We also have halogen recessed and pendant lights. I don't notice, much if any, difference in the color between the too, we find both to be pleasing. As to dimmers, our fixtures each have high/low/off switchs. With these, we have not felt the need for a dimmer.

Here is a link that might be useful: Pegasus Lighting