Philips SpotOn Motion Sensing Auto-On/Off Triple LED Light

That's a lot of technology for $15.50.

And it does what it says, namely:

1. Automatically goes on when something in its motion sensing field moves

2. Gives a nice bright light

3. Automatically turns off after 15-20 seconds of absence of motion

At that rate the batteries (3 AAA, included) should last for years.

Much better than those press-to-turn-on iterations that automatically go off — but require you to first find them in the dark to turn them on.

I've been wanting something like this for decades, I'm glad it finally happened.

I'm putting 'em in all the closets and cupboards and cabinets that up to now required me to turn on a regular light to see inside.

The device measures 3" x 2.5" x 0.6".

Three ways to mount it if you choose that option: included double-sided adhesive pad; included magnets; screws/nails through the pre-drilled holes in the back panel.

Couldn't find an online source but they'll be in the light bulb section at your local supermarket.

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Note added 3:34 p.m. today: reader Kay just emailed me with an online source — $15.50 right here.

The website notes that "unlike its imitators, the SpotOn does not require you to remove it from the wall to replace batteries...."

Good point.

Also: "The bad news? This light doesn’t know when it’s light outside. If used in a bathroom or other naturally illuminated location, the light will come on for daytime motion, too."

Another good point.

But if that's the worst thing about the device, hey, I can live with it.

Congratulations, Kay, on becoming the newest member of my crack research team.