I bought a couple of strings of holiday lights last night.

Talk about a tough item to buy with any meaningful electrical info,
wow.

I finally found one brand of lights (100 itsy bitsy lights on a cord)
with packaging that included a note about a 3-amp inline fuse. Aha! Now
that's something I can relate to.
I'll figure two strings, drawing no more than 6-amps. I won't be
exceptionally bright, but then again I'm never expected to be all that
bright. :-)

The toughest part of these lighted boat parades is maintaining night
vision. Sure as heck there will be somebody covered with bright white
lights, 12 kW genset running hard to keep up with the load.