In article , Ted Edwards says...

For many years I've used a carbide lamp with a somewhat oversized
reflector. 4 hours operation on a film can of carbide. Good flood at
your feet with a real reach to the spot.

Those work great - one problem is that folks are not used
to seeing such a strange light. Another is that the open
flame is a bit hazardous, especially indoors.

But those sure are bright. I bought one of the large
supervisor sized ones, with the extra sized reflector.

Jim

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