Mood lighting for the carrots you're about to chop up? They might appreciate it. ;-)

Kidding aside, is it an expensive lighting upgrade? If not, I'd do it because lighting versatility can be nice. (Why do YOU think it could be useful?) If it is expensive, I wouldn't bother because under cabinet lighting is mainly task lighting and you want that on full blast.

Love my dimmer. Not expensive at all. It's been about ten yrs now? I just have it on one run over the sink side and use it as a night light on '1'. Mornings '2' or '3' is sufficient. kitchen prep/cleaning '4' is nice and bright.

I think dim. if you want bright lights then just keep the main light on. but under our cabinets we did dim lighting and it gives a romantic look. it also is good for nights when you don't want to have the full lighting on. its almost like a night light for midnight snacks. but definitely dim lighting makes more sense.

Yes for the dimmer. I asked the owner of my local lighting shop what he installed in his own kitchen- he showed me the exact product, said get the brightest possible LED tape with a diffuser, and include a dimmer. That spans the range from bright task lighting to dim ambient lighting.

Dimmer switch for sure - it's nice to have if you want to leave lights on for an overnight guest who may want a glass of water during the night and not know their way around.

Love my under counter dimmer. Great for keeping a light on in the kitchen at night.

I use my dimmer at its lowest setting every morning when I want to hide the fact that someone is awake...no glow from the kitchen. During dinner prep I have it the brightest. Absolutely love having choices.

To add to the overwhelming response...YES to dimmer switch! I use it all the time to adjust the light to what I need at the time.

It's also nice for "atmosphere" lighting.

All the lights in my Kitchen are on dimmer switches and I use the dimming feature on all of them -- I'd never do a Kitchen without them! (Recessed lights, pendants, under-cabinet lights)

Have lived here almost three years, and just planning our kitchen remodel. The current UCLs are on a dimmer but I never turn them on in the first place. Only one who does turn them on is the house cleaner. I won't be putting UCLs with or without a dimer in our new kitchen. If you have an open floor plan and need the dim lights for 'atmosphere' while dinner, that's up to you.

I use my UCLs almost every time I go in the kitchen. I use the dimmer function frequently, depending on what I am doing. I prefer UCLs to the overhead lights for when I am in the kitchen, but not actually cooking in the kitchen (i.e. when eating, cleaning, or just hanging out).

But for prepping, it's not about "atmosphere" that Sushipup1 mentioned (I also do not have an open floor plan so not sure why Sushipup thinks that's a pre-condition for dimmers or for UCLs). It's about needing light for those tasks on the counter. The ceiling lights cast some shadows on the counters, and also don't light the counters completely on their own, due to the upper cabinets over the counters. So UCLs for me are a necessary adjunct for all prepping for meals. I have them on full for prepping along with the ceiling cans, and dim them otherwise, according to the situation - no ceiling cans and very dim UCLs in the evening for grabbing a snack to bring into the living room for TV watching, or somewhat dim in the morning to save my eyes from having to go from dawn darkness to surgery-room brilliance of lighting without dimmers.

There would be no benefit or advantage whatsoever to my kitchen from foregoing UCLs which are on dimmers.

I have dimmers on pretty much every light in my house. Why wouldn't you want to have more flexibility with your lighting? I even have dimmers on the recessed lights in my shower.