Consider Motion Sensor Switches At Home
By Chris Baskind in The Daily Footstep
Your parents were right: a good way to trim that monthly power bill is simply by remembering to turn off lights when they’re not necessary. And one easy way to do this is by installing inexpensive motion sensor switches on light fixtures around your home. Hallways and lesser-used rooms are the best prospects indoors. They’re also a convenient way to control electrical costs with walkway and porch lights.
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I can see what your problem would be there. Short of installing a second sensor which can sweep the shower stall, I can't immediately think of a cost-effective solution. Of course, motion sensors aren't appropriate for every application. We've got some sharp readers — maybe someone will offer a workable suggestion.
That's a fair question. I think the answer is going to be a bit slippery, though, depending on your household habits, the wattage of the attached fixture, and how long the device would remain installed. I've seen simple plug-mounted motion sensors for as little as $4.00. The U.S. national average for electrical power is about 11 cents per kilowatt. An unattended 100 watt bulb would consume roughly a kilowatt hour if left burning all night. That's a little over $3.00 a month. So you'll clearly save with things like hallway and outdoor security lighting, if they would otherwise be left in constant duty.