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From: sms <scharf.steven@geemail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: bike light optics
Date: Fri, 5 Apr 2024 09:36:27 -0700
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On 4/4/2024 4:16 PM, Roger Merriman wrote:

<snip>

> The lamps as far as I can see are relatively speaking inexpensive, at least
> compared roughly to batteries powered units, the expensive bit would seem
> to be a Dynamo hub and wheel even if your building and installation
> yourself, which is probably a technical hurdle beyond most.
> 
> I’m really not a good fit for such lights, mainly that I want lights with
> more power with the MTB/Gravel bike can get at least one dynamo lights with
> a off road beam shaped but even so with a 3w limit it’s power output is
> lacking for that purpose ie 800 lumens at 17mph+ my light kicks out at
> least double that with potentially up to 3 times that, as it uses how fast
> how much the bars are moving to gauge the light needed.

I have dynamo wheels on some bikes, a Dahon folder, my road bike, and 
one other. These are adequate for DRLs, but of course for night riding, 
even the higher-end dymano light I have is not sufficient on unlit roads 
or MUPs, and being from Europe there is no flash mode.

What would be nice is a higher-end battery powered light that could be 
charged with a dynamo, and operate at lower power directly from the 
dynamo, but there is no such animal. A dynamo to USB-C PD adapter would 
be perfect but all the dynamo USB commercial products are to 5VDC only.

-- 
“If you are not an expert on a subject, then your opinions about it 
really do matter less than the opinions of experts. It's not 
indoctrination nor elitism. It's just that you don't know as much as 
they do about the subject.”—Tin Foil Awards