15m Nav Light Requirements

[anjou]

Im fast approaching the wiring stage and need to make provision for nav lights.
Im more than a little confused by the options open to me and could do with some advice please.

With a vessel of 15mts (50 feet), do I need lights on the front corners or can I adopt one tri colour on the mast head? If I can, do I also need a separate anchor light?

In addition, what do I need at the blunt end, where is it positioned etc?

I dont anticipate them being used often, but should the need arise, its preferable than having to hang on temporary ones