I was thinking that what I really want is some light source that could be distributed around the house that offered (1) motion sensing, (2) dark activation, and (3) rechargable batteries.(5V USB?)
(4) easy mounting for stairs etc.
I don't want to run wires for these emergency lights!
Do you have cordless tools? Mine are 18volt Makita, and I have two different LED lights that use the Makita 18volt batteries. I always have a bunch of batteries that are charged for the tools, so it's easy to use the LED flashlights when power goes out.
One of the lights is kind of a spotlight and it's super bright. The other is more of a flood light that lights up a big area. When the power goes out, we turn them on and leave them on all evening until we go to bed. One is kept in the garage so we can see when we go in there. We go in there a lot. The other is in the living room, and it lights up the entire area. Neither have ever lost there charge in a night of using them.
If I was going to spend money on battery powered lighting, I would buy a few more Makita LED lights.
Amazon.com
I also have the Makita radio. With cell phones we don't need it to hear the news, but it's nice to have music on if we are waiting for the power to come back on. A 3.0 battery will last 8 hours at a modest volume.
The issue with just about every other type of battery powered light is the battery. The Makita batteries are very good. I'm sure DeWalt and Milwaukee batteries are very good too.
Usually, we wait an hour when the power goes out or check with the news and power company to get an idea how long it's expected to last. If it's a short time, we will wait it out. If it's going to be for several days, or even a week, we pull out the extension cords and fire up the generator.