What lights can I use if out after dark on a boat?

[hscrugby]

I know the nav lights are pretty clear,
red/green forward facing. white all around.

Like this:


Is there anything I can do to help with vision that won't confuse everyone else (and be illegal) for when heading back to the dock? Or for around in small little coves etc? Either that, or do I just need a new rear white light that's brighter?

(Yes I know to slow down in the evening, but I don't want to have to troll if I can help it. )

Thanks