Okay, so only landing lights on the planes that can support them, such as the hurri MK I and the P-38. Now I know those have lights cause i've seen light-slots on the wings. Yeah, now that I think about it navigation lights wouldnt serve much of a purpose at all. And beacon would get people confused with the little "Beacon" instrument describing host connection with the actual lights.
They would be stumbling around saying, "Hey, I hit the light switch for the beacon, but the instrument says their not on!"