Cold light -[ HSS ]-

A stroboscope. It uses the same basic xenon flashtube technology as flashes, large and small, for photography, except that it's designed to flash at an adjustable rate to freeze motion, such as shown in this clip I recorded over seven years earlier.

 

The unaltered photo was originally going to be used as a recent Macro Mondays submission, but I decided against for fear it might not conform to the theme.

Done