Best bicycle front light optic

[faklya]

I'm looking for the best optic for my DIY led bicycle front light.
I think I need elliptical beam around 20°x10°. What is your opinion, which is the best beam pattern for bike, and where I can get the best optics for?
I saw this headlight and the beam is pretty much the same as my good'ol halogen:

Elliptical beam, bottom wider, top narrower and brighter. I like this pattern, but it's probably hard to find a lense or reflector which achieves this with a single emitter at a reasonable price. Probably with two emitters it's easier to make this beam. What would you recommend, I'm waiting for your DIY ideas, thoughts, opinions.

 

[Chriss]

Hat hogy pont ilyet talalsz e azt nem hiszem but anyway i recomend you a narrow 10° and a mid wide 30°lens combinations.

 

[Cemoi]

See this thread in the LED forum. There are several elliptical optics (Fraen, L2, Ledil) but it is still unclear to me which optics fit nicely on which star-mounted LEDs.