19-Set Indicator Lamp question

[David Dunlop]

Going through one of my wireless odds and ends boxes today (it was either that or shovelling the driveway) and I rediscovered a pile of plastic lenses I have accumulated for the indicator lamps found on the 19-Set PS and some of the Control Boxes.

What I have are clear, clear pale yellow, clear amber, clear ruby red, solid white and solid red. The clear pale yellow ones appear as though they might have originally been all clear and have simply discoloured over time, but the rest are all very likely factory coloured.

I am familiar with the clear ruby red and solid red installed on PSU's and the control boxes but have never seen any of the others used for these items. Perhaps the other colours don't even relate to the 19-Set. If anybody has an answer, I am curious.

David