How or why is it helpful for the lights to switch on in an empty room just so you don't have half a second of darkness when you walk in there twenty minutes later?
You sound irrationally angry but I’ll bite anyway.
1. At night we are turning all of the other lights off. Our bedroom door is open, so the light dimly illuminates the way to our room without having to turn on hallway lights.
2. When we aren’t home it still happens giving an impression someone is home.
3. It looks nice when you walk in.
4. The convenience is worth the $0.00036 in electric cost per day. (Approx 6w * 0.12/kwh * 30 minutes). That works out to be 13 cents per year. The benefit of 1, 2 and 3 above divided by 13 cents per year gives quite the positive ROI.
