Dark Building Lighting Ideas

I've been asked to do several "dark building inspections".
Retail stores, which are closed for business. One of the
things to do, is to take a lot of digital photos, and email
them to the headquarters.

The one building I was in, had electricity, but for whatever
reason, I couldn't get the lights to work. So, I'm walking
around with my Mag light, and a flash camera, taking photos
of wall damage, water on the floor, and so on.

I'd like to find some kind of light that will have good
output, and be a fairly even light. Flood light, of some
kind. To suppliment the light that my flash camera provides.
The last time I was in the store, I was there for about
three hours. So, the light should ideally work for at least
three hours on a charge, or on a set of batteries.

Ideas?

--
Christopher A. Young
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