Re: For those who believe in electricity

On 4/11/2025 1:37 PM, Roger Merriman wrote:

Frank Krygowski <frkrygow@sbcglobal.net> wrote:

>
I think only a small percentage of cyclists are aware of the importance
of optics. I think almost all cyclists get their "education" (such as it
is) from product advertisements. And ever since white LEDs began their
rapid rise in lumen output, lumen counts have been the almost exclusive
message in advertisements

 I believe most of the bike lights manufacturers have always used lenses to
greater or lesser degree, was a period when some of the Chinese led
lights/torches that where lumens only and not true figures!

I don't think that's true at all. Take a look at some of the beam shots at this site: https://bikelightdatabase.com/beamshots
Or go to https://road.cc/content/feature/roadcc-front-bike-lights-beam-test-310999   and look at the beam shapes of the Ravemen and the Knog.
In the past few years, there's been more attention to optics, but I think there are still plenty of small manufacturers who use rotationally symmetrical optics. Peter White has an explanation of why those are far from optimum, at https://www.peterwhitecycles.com/plight.php
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- Frank Krygowski