I've been enjoying my 2012 Int'l but one of the things that has bothered me is the brightness of the LEDs in a few locations. LED lighting is terrific for boondocking and overall efficiency. But whoa! Those rascals are bright -- especially if you need to flip on the light in the middle of the night!
LEDs need a PWM or Pulse Width Modulator dimmer to be dimmed effectively. They can be found all over eBay but I learned a lesson on which type to buy. See the two pictures below for my comments. The one I recommend has a 5K potentiometer and a smaller internal circuit board. The other model has a 1K potentiometer and a larger circuit board. The smaller circuit board makes it easier to insert it behind the aluminum skin through existing cut-outs for light switches and fixtures.
The two locations where I have installed these dimmers are in the corner bath and in the kitchen area. My 23D has a single LED fixture in the bath which is controlled by a switch outside of the bath next to the adjacent sink. I chose to install the dimmer inside the bath rather than at the switch so it can be adjusted after the light is switched on and the door is closed.
For the kitchen, I chose to install the dimmers directly above the wall switches. They control the two pucks over the sink and the three pucks inside the overhead cabinet.
Overall, I'm happy with the installation in both locations. One thing to note, these dimmers do not appear to dim in a linear fashion. I'm not going to pretend to understand the technical explanation I read on another forum about this but my understanding is that the dimmer really is linear although it doesn't appear to be. My non-technical description of what this means is this: while the knob travels in about a 340 degree rotation, the full dimming function is found in about 30 degrees of this rotation. Rotation before this mark is either fully "off" or after this mark is fully "on."