Ever notice how hard it is to see outside when in your house at night, with the lights on? Turn the lights off and you can suddenly see outside! Amazing how that works.
Now, if we installed a lighting PCB in the vista dome it would have required screws to mount it to the roof of the vista. This would have made it visible from the side PLUS there would be wires running down to the car body (we haven't quite perfected wireless power yet, but its likely on the same container with Fastrack Expander Paste!).
Had we installed lighting in the dome, passengers would complain about the reflective glare and that they could not view the stars at night. Hence, no lights in the vista domes!