Whether you've got a dark closet with no electricity running to it or a freezer without a light, the Philips SpotOn LED motion-sensing portable light illuminates the dark corners of your place.
In fact, a freezer lacking a light is exactly how Joseph Stirt over at Cool Tools put the SpotOn to use:
[The missing light] wasn't enough of a pain to go through exchanging refrigerators, but for the past 15 or so years, it's been a minor annoyance, requiring me to turn on a kitchen light to see what's in there. Until I remembered these motion-sensing LED lights I'd already placed in about a dozen spots throughout my house. Who says I can't put one of those in the freezer compartment, such that the motion of opening the door turns on the light? So I did just that and darned if it doesn't work beautifully. Better 15 years late than never.
The SpotOn will set you back $17 on Amazon.