We had a Davis until a couple of years ago. We were anchored about 2
or 3 miles away near mangroves all alone on a dark, clear night on the
Bay side of FL Keys. We became somewhat concerned when we could not
see the boat from what we were sure was less than a 1/2 mile out. In
fact, we had to do the old latitude trick and go near the shore below
where we knew the boat was and follow it up till we hit it. We
actually saw the hull the same time as the Davis light.

Needless to say, the old .4 amp Guard approved light (and I thought it
pulled 1 amp before getting an amp meter) went back up there upon
returning.