Your right. I think its 112.5 degrees for port and strbd (225 total arc centered to the bow.) (of course, that leaves 135 deg for the stern light).
You know . . . the colregs don't specifiy a vertical angle requirement. I wonder why. Although the ocean is a fairly 2-D environment, a sailboat heeling on waves and observers at different heights can affect the visibility of these lights. Have you ever heard of a vertical angle requirement by the USCG or intl ColRegs?
I'll try to go out to my slip tonight and give it a shot. I bought the bulbs by accident - I might as well experiment with them before I return'em.