Have you ever seen magnesium in strip form burn, it takes just seconds to burn - but yes it would be a nice bright light.
Originally Posted by eh4
Just brainstorming, not too practical but...
how about a reflector setup like the carbide lamp that burns a clockwork fed coil of Magnesium ribbon?
Lots more trouble of course but it would be bright... (a flow of gas might be needed as well to keep ash off the reflector).
aaahhh, I see that smokelaw1 covered this already.