Seems like this exchange here has stopped.
Have decided not to use any off-shelf LED navigation lamps for all-rounds at mast-top.
Will be using Waterproof LED Flexible Light Strips.
Have located FCC/CE IP68 strips installed (per Colregs r.o.g.) on a SFBay Triton.
Nufsaid. Later.
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Two person or singlehanded offshore night sailing wisely suggests reefing the mainsail.
A 4' luff reef would expose enough mast for meter separation between all-round
red at mast top and all-round green 39" below.