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From: Rolf Mantel <news@hartig-mantel.de>
Newsgroups: rec.bicycles.tech
Subject: Re: bike light optics
Date: Tue, 9 Apr 2024 11:35:07 +0200
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Am 09.04.2024 um 07:57 schrieb Jeff Liebermann:
> On Fri, 5 Apr 2024 09:36:27 -0700, sms <scharf.steven@geemail.com>
> wrote:
> 
>> 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.
> 
> Good idea, but the dynamo might need to be enlarged to handle the
> combined load of charging the battery and powering the light.  It is
> possible to do both with the existing 3 watt dynamos using PWM (pulse
> width modulation), where the waveforms for powering the light and
> charging the battery are interlaced so that the dynamo sees only one
> load at a time. 

<https://nabendynamo.de/produkte/ladelux/>
will go to market this summer.