I've replaced all of the 12V incandescent lamps with LED's. Replaced the puck lights over the sofa, the wall lamps, the dining table lamp, and the stove vent lamp with LED's, too. Sitting in a box near me at home are LED replacements (reflector style) for the four reading lamps, as well as the parts to put switches next to the bed where they're accessible, instead of having to get out of bed to turn them on/off. We have three 120V lamps we use in the rig and I've got LED replacements in the box for them, too (from Home Depot). I bought all of the 12V ones on eBay.
At home, I've replaced the twenty 65W reflector can lights with 9.5W LED's, as well as some of the table lamps.