How is the sparhead issue different than on any rotating rig, where
sparhead lights are in stacked sets with switches.

Is downwind work asumed to be with the sails at 90 degrees? That is
only possible due to the aerorig config, one could have the sails set
more conventionaly, or be tacking downwind, in which case sparhead
lights would be fine. I don't know enough about aerorigs to know
what is the best way to sail them downwind

It ought to be possible with LEDS to have any sparhead variable
lighting configurations one wants including "Sale in aisle three".

Further bad news is that one would have to be careful about twisting
up the lights if they were operated off a wire, since the rig can
360. With LEDs, battery operation is at least a possibility.

> I thought about the masthead nav lights but this would not work.
Particularly with downwind work when the rig is a right angles to the
boat.
> Imagine approaching the proa from the WW side when it was going
downwind and reading the nav lights to be coming straight at you. You
cant see a stern light because it is behind the hull on the beam so
you are more convinced it is coming straight for you. You then veer
to port/starboard and next thing you know there's a bow where the
side of your boat used to be. Not good and who's to blame? The Proa
> The lights must be on the hulls as suggested and I suspect that
amidships would be the optimal place(the highest point possible from
the water)