I have installed dimmers by quinetic, but with limited success. I agree, it seems odd that they can work, but in fact they are rocker-type switches, so you hold down and the lamp switches on and progressively brightens, and you hold the switch up and the lamp progressively dims. However, as i have mentioned before, they don't work with every lamp. I used them with 600 x 600 LED ceiling panels and they were very erratic, sometimes working ok, sometimes changing light level randomly or getting "stuck" at a certain level. I queried this with TLC from whom i got the switches and the LED panels, and they came back to me after checking with the panel manufacturers and said that they weren't 100% compatible. They immediately replaced the switches with non-dimmable ones and all was fine. Therefore i suggest you check compatibility if you are using LED lighting. i believe they are fine with other types. As it happens, I was fitting18 panels and only wanted 2 to be dimmable, and in the end it didn't matter anyway, it was just an "extra". FYI these are the panels:
which are quite expensive as you need a driver, and a frame for ceiling mount, but they are fantastically bright, easy to fit, and you can plug in an emergency light module as well, if needed. They come in warm and daylight and cool white etc.
The blurb says they are available as dimmable versions too, but that wasn't the case when i fitted them, so maybe they have overcome this problem. Anyway, I'd check first.