Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Getting back to your original question, I do not believe that it is possible to wire the Lopolight to power your tricolor, XOR your anchorlight with only the two wires leading up the mast. One of the Lopolight wires is a dedicated negative, shared by both lights, and the other two are used to power select either the tricolor, or the anchor light.
Using a set of diodes, and a DPST switch, you can reverse the polarity going to a fixture with two bulbs, but this requires using the negative lead for one circuit as the positive lead for the other. I don't see how you can do this with the three wire Lopolight setup.
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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Certified Instructor - Also certified in Recreational Marine Electrical Systems