Note the lens design which focuses the light from the bright bulb on the horizon. The side plate provides an accurate projected light beam angle for the additional safety. With these high quality lights, you are sure to be seen from all points with either a red, green or white light, yet the white light wont shine forward so you won't be mistaken for power boat.
This isn't just for snob appeal. Remember, if you display a white light forward you must operate using the rules of the road for a powered vessel. See the related products below for proper pulpit mounting bracket.