Fujichrome Sensia 100, OM-2S, 21mm lens, 1/60 second at f/11, T-32 electronic flash, tripod.
"These two bulbs were the work horses of my Camps imaging. On your left is the Meggaflash PF330 flashflood lamp, which burns for nearly two seconds. The other lamp is a 70 year old GE Mazda Type 75 foil flashbulb. The PF330, although slightly less powerful than the huge 75's, is a much more practical cave lamp given its relatively small size. Each lamp, if you can find them, cost $30 to $50 each!"