Edgerton is a DIY high-speed LED flash. It was designed for photographing bullets breaking glass. Unlike an ordinary camera flash, it can produce flashes lasting less than one microsecond. This means it can be used to photograph bullets without significant motion blur.
For more info, see http://www.gerritsendesign.wordpress.com/2019/05/14/edgerton-a-high-speed-led-flash-diy/
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td0g