Originally Posted by
PatrickGSR94
My experience is that even with a narrow(er) beam, the width of the beam at 100-200 feet away is plenty wide enough to extend all the way into the adjacent lane, and certainly straight back behind you. So an approaching vehicle from behind you will still be in the "useful" beam area when they're back far enough to move over to pass.
I haven't not experienced that all with the real narrow jobs, in fact just last night I came riding up behind a cyclist with a flashing light on and the light faded to black at about 20 degrees off axis and remained completely dark as I passed, not sure what brand he was using. There are some narrow beam lights that either use a another set of dimmer LED's for side illumination or use a amber side lens to let the main light shine through, or wrap the lens plastic around to the base to give it a very slight glow which is still useless.