Comment by MostlyStable

It's not a cost thing, I just don't like changing bulbs. I find it annoying, and with enough bulbs, when the lifetime is down to 4 years, you are doing one every few months on average.

But yes, I have thought about presence sensors. I'd really only need 3-4 to cover the primary areas where lights get turned on and not off (if I don't do it). I just haven't gotten around to it