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.
The total cost for all parts is $165 CAD, making this an affordable way to get into high-speed photography.
For more info, see https://hackaday.io/project/165622-edgerton-a-high-speed-led-flash