Years ago I stumbled across a website belonging to a spelunker. There was a section of Q&A about obtaining the calcium carbide needed to run an acetylene (carbide) lamp.
Carbide is listed as hazardous materials, and shipping is horrendous.
This was long before there were ANY LED flashlights.
I would guess that carbide lamps, with their fire hazard, and difficulty obtaining calcium carbide, have all but dissapeared, since high quality, reliable, and long running LED headlamps and flashlights are now so easy to obtain.
One of my college roommates had a carbide lamp; he used it for his brand of fun: winter camping. (I can't believe he used to ENJOY that, I hate winter. Winter in a TENT? Just kill me now....)
He had a good sized can of carbide, and we used to fill various things with acetylene, and ignight it.
The lamp was top of the line, using a flint wheel for ignition, and having a chrome plated reflector. The lamp was all brass. It didn't seem all that bright to me, but I never saw it with dark adapted eyes. I was more interested in capturing acetylene in plastic bags, etc.
I wish I could get a nice carbide lamp, and several pounds of carbide. Nice toy for long winter nights. /ubbthreads/images/graemlins/grin.gif