I decided that my 212 should have lights as it should have according to SOLAS (International Convention for the Safety of Life at Sea). The goal is to activate the lights by a free servo channel.
For submarines the running lights are naturally situated at the turret as the rest of the boat is on the waterline. Even though the boat is more than 50m it has only one toplight. This however bears the danger that speed and size of the boat is underestimated at night by other vessels. Therefore the boat has an additional orange/yellow flasher 1m above the toplight (1.5-1.7Hz).
On the pictures below the intended lights can be seen: