Further Experimentation
The light provides good, general illumination, but is really hard to look at. Did some further experimentation with using it for marking / or signaling. Bungied a simple piece of yellow Plexiglass acrylic across the lens, and viewed it from 200 and 300 feet away at night. Really hard to photograph with an iPhone, but really impressed: clear, bright, conspicuous. Optical quality filters/gels might even improve or extend the range.
BTW, as a Li-Ion device, the light goes out like a switch when the battery is drained to a certain level. This occurred to me on the 'High' setting', but I still had a few minutes of time on the 'Low' setting to 'get back to base', switch out batteries, etc.
Philbert