From what I've seen the LED-based anchor lights are brighter, not dimmer than their incandescent counterparts.
I was having a beer with my friend who skippers about 50,000 tons of bulk carrier and he made a very interesting observation. Twice they have had to sheer off hard - not easy for a boat that size - because the color of "white" LED mast head & steaming lights is almost exactly the same as a star. He explained, those lights tend to be weak and look exactly like stars from a few miles away. They are so small you do not notice them getting closer on a moonless night until you are right on top of them. This from a very experienced and careful professional seaman who also owns a lovely sail boat. He uses loads of LED's on the boat but not for his navigation lights. Next time in a dark anchorage look at the other boats mast head lights and you will see what he's talking about right away. Meggi once mistook one for Venus and was waiting for it to get a bit higher so she could practice with the sextant.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.