We like the Kichler direct wire Low V xenon strips that we had installed in our reno this past summer. They give off a very "natural" light spectrum and, at 1"h, they are quite unobtrusive under the cabinets (we don't see them at all behind our 2" valances. We have an off-white Caesarstone quartz countertop and weren't concerned about glare. We also like the after-sales support we get from Kichler. They come in 7, 12.5, 21.5, and 30 inch lengths and fit all our cabinet requirements.

Downside: they do produce quite a bit of heat (as all xenons do).

Our criteria:
- "natural" spectrum of light
- direct wire
- weren't worried about line vs. low voltage but wished to avoid the bulk of a separate transformer
- dimmable or at least high and low settings
- slim or at easily hidden behind valances
- high quality construction

If you have dark granite, I've heard from colleagues that they were advised to steer away from LED and xenon and toward the warmer light of fluorescent.

Here is a link that might be useful: Kichler

Dimmers are too compatible with LEDs. Maybe pegasus just doesn't carry any! Environmental Lights does!

Here is a link that might be useful: Dimmable LED undercounter lights

"Dimmers are too compatible with LEDs."

It all depends on how the low voltage is generated.

Actual transformers need magnetic dimmers, AC/DC power supplies can be designed to work with conventional (Triac) dimmers.

... you could also consider going with xenon and installing a dimmer to maximize efficiency.

Actually, with incandescents a dimmer reduces efficiency.

While dimming an incandescent does reduce the energy used, it lowers the filament operating temperature so that the efficacy (in lumens per watt) is reduced. This means that for best efficiency in incandescents, you should install the wattage you actually need, and operate them at full brightness.

Or install dimmable LEDs or fluorescents, neither of which suffers the same level of efficiency reduction when dimmed.