If you are pushing a huge amount of light and the beam doesn't have a sharp cutoff on the top, I think you're inconsiderate and dangerous. I think there aren't many occasions when you need such light power.

I suggest you take a look at what your local bike shop has. And be sure to aim your light so it doesn't go in people's eyes. It doesn't have to be in their eyes to be visible. They are likely to have something that is bright enough for riding a bike.