Ken H joined the community
This lighting kit was used by the Royal Artillery. It fixed on top of the Director (a type of theodolite, used for survey and orientating guns) so that it could be seen by other optical instruments, mainly other directors and gun sights when being used at night. The different coloured filters meant that you could use more than one director, distinguishing them by the various colours. I was the Survey Sergeant in an Artillery battery and still had these on my charge up until I left in 1990.