Time lost to light switches in a year is measured in, what, 10s of minutes and maybe $20 in wasted electricity and bulb-life a year? If you have a pretty big ho

Time lost to light switches in a year is measured in, what, 10s of minutes and maybe $20 in wasted electricity and bulb-life a year? If you have a pretty big house and are kinda bad at turning off the lights when you should? Even a perfect solution that never screwed up and wasted my time would have to also be very cheap ($100-200 for whole house—yeah, right) and take no time to install/maintain for that to be worth it to me.