Another vote of confidence for the folks at M4. I replaced all the incandescent bulbs. I called rather than work through the web page. I told the salesman which fixtures the bulbs were going into and what I wanted to use the bulb for. For example on the exterior light the fixture is covered with a yellow lens. He suggested a bright white bulb. On the room lights I got a softer light with a color tone like that of an incandescent bulb, over the stove a bright white light. Bathroom shaving light bright but a little like soft white like the old bulbs and so on. I was amazed at how little power these use. The wife, who likes to leave the lights on until bed really likes the switch.