Just been sorting out how many Berko ground signals I need, and which ones I need to light up. They're tiny, but so effective and useful for the many shunt moves around the layout. They are a pig to wire though, the tiny strands from the LED bank suspended under the layout are very fragile. I've sorted out about 5 so far. The wiring is odd. The pivot lamp (Bottom right hand side) remains lit at all times. And the other white and red are the on / off lamps. These are set in the "old days" when they displayed a red and white for on, and two whites for off. Nowadays, the pivot light alternate two red or two white depending on the aspect shown.
I'll upload some pictures - they do look smart but you sometimes have to ask - are they worth the effort? I know they're there I suppose.