I've flown with nob-end trainers who learn an unknown fact about the aircraft and use that to prove they know more than you; while missing the basic (thorough) knowledge a good trainer will know... kind of a way to cover their inadequacies.
LOL
Have came across such losers as well, from an engineering point of view They state one unknown and not so important fact to built up the mystery that they know the a/c inside out.
But seriously, isn't it 2 lights that are activated when you switch on the landing lights.
The only reason i can think off is to give pilots a tactile way to locate the switch if the cockpit is filled with smoke, as you mentioned. Or it could be something brought over from the maritime sector like many things in the aviation sector.