I have installed a custom lighting solution with two high-power LEDs onto my bicycle, but after doing some final positioning adjustments, I ran into a small problem.

Namely, oncoming traffic gets totally blinded!

However, if I aim the lights down, they illuminate too close, too intensely. The lights are low-mounted (below front wheel axle), which definitely intensifies any angle issues, but is otherwise extremely beneficial since it shows the road profile much better. I do not want to change the light position - lighting from above is much less useful in my situation - I drive on paved roads and seeing potholes and other defects is the most important goal for me as far as lighting goes.

What I need seem to be sharp-cutoff lenses, like used in cars. Unfortunately, I have never seen any designed for small LEDs.

Here is what lens I am using right now: http://www.leds.de/en/High-Power-LED...ain-tight.html

Have you run into this problem before? Are sharp cutoff lenses available from anywhere?

Do I have some other options here? Can I manually modify the lens? I did some experiments but nothing usable came out of it - just randomly more diffused light - it seems infeasible to modify the lenses with any accuracy.

I really don't want to blind drivers...