Originally Posted by
rekmeyata
why most dynamo lights, like the ones you have, can emit a very intense beam onto the road yet do so without the very dim lights of the old round beam which wasted a lot of light energy that a dynamo system could not afford to lose, but up until shaped optics they had no choice which is why dynamo systems didn't sell very well.
You don't know what dynamo lights I have. The dynamo lights I use regularly are DIYs with conical non-shaped beams, with 4 to 6 high powered leds. The shaped beam light I have, the B&M Eyc, is on my least used bike. Shaped beams aren't all that.