Cabin lights/ LED lights

[ebb]

Thanks Bill,
My interpretation is this (please correct me if it is wrong.)

A/Cs which are under 10 meters -
and rigged with a tri-color masthead light -
can steam around (sails up or down) in the dark of night -

with a tri-color (port, starboard, and white stern) turned on.

But, as a motorboat,
should I have the all-round 'anchor' light on as well?
I assume this light in the fixture is separate from the three color light(s)
and is above them in the same fixture. (?)

Is not the all-round masthead white light used only when anchored?

IE, it is correct for 338 to only have the normal tricolor on when under power at night.

It sounds like a green/red pulpit light
and the pushpit white stern light are used
as a complete extra system backup. Or
when the tricolor is not being used. When
motoring with these lights is the
masthead all-round white light also ON?

What is unclear is how an allround white
masthead anchor light can be used on a moving boat. (?)