Perkins Elmer "High Performance Flash and Arc Lamps" catalogue. ~40 pages with about half the contents being a tutorial on how they work and how to select and drive them, and why. http://laser-caltech.web.cern.ch/laser-caltech/report/Flash%20lamp%20Eg&G.p= df Almost a black hole in its own right. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .