I had that same problem big time on our 38 when we first started overnight crossings of Lake Huron each summer, and it really bothered us. My solution was not ideal in that what I did slightly altered the arc through which the bow lights could be seen on each side. But in the photo below you can see that I mounted a sort of circle segment shaped piece of 1/4" thick black rubber gasket material behind the light with zip ties. I kept playing with the size and shape until it was just large enough to block the reflections off the pulpit and from the light itself, but no larger than it had to be. I probably reduced the arc from the required 112° on each side down to 95° or 100°, but at least I didn't have my night vision ruined by my own bow light anymore. Most of the time we were motoring so a masthead tricolor wasn't an option.