Good for you! My mantra for this kind of change is "every bit counts." No, I can't fix the world, but I can fix my own behavior...

The new house had every possible kind of light bulb and some very old can light fixtures that are original to the house - 1980 build. Room by room (or hallway), Achaosofkittens and I have been replacing the entire set of light fixtures with dimmable LEDs and accompanying switches. The justifications for the expense and work are: 1. better light 2. cooler light (incandescent lights heat up) 3. less electricity 4. longer-lived bulbs 5. lower fire hazard.