This is a UV coated 5300° K plug-in 600 w/s flashtube for the Broncolor Minicom 80 monolight.
Most current, professional flash heads and monolights are equipped with user replaceable flashtubes that may simply be plugged into, and unplugged from their sockets. With proper handling, these flashtubes may last for tens of thousands of flashes under normal use.
This flashtube is UV-Coated, or UV-Corrected. UV flashtubes have a yellow appearance, and they counteract the excess blue 5700° or higher output of non-UV coated flashtubes.