Originally Posted by
PlanoFuji
Possible, but considering your claims (which are based upon your subjective perceptions instead of objective measurements) require power output from a dynamo that is far in excess of what any reputable source has ever claimed it is much more likely that you are the one mistaken.
It's more likely possible you're misunderstanding reputable sources.
This reputable link says otherwise.
http://fahrradzukunft.de/14/neue-nabendynamos-im-test/
hartsu posted a google translated version if you can't read german.
Originally Posted by
PlanoFuji
So, you admit that those reputable manufacturers are 'fudging' their claims (since they have never actually measured their devices) but you just want to believe they are only fudging a little bit. However, I did notice that you haven't actually provided any engineers statement (as opposed to the marketing guys) who claim their lights are receiving more than 4-5w...
I don't need to believe their lights are receiving more than 4-5w, I understand their lights are receiving more than 4-5w.
Originally Posted by
PlanoFuji
First, I wasn't talking about head lights there, but tail lights. You have shown more than 3 versions of such....
That's not possible, I only have 3 versions of taillights shown on this forum, no more than that.
Originally Posted by
PlanoFuji
The spec sheet for the Cree XR-e shows a 100 lumen per watt curve.... Your claim of 1000 lumens therefore requires at least 10 watts from the dyno, actually quite a bit more considering how inefficient your circuit is in providing power to the LED. Actually, given the inefficiency of your circuit, even the revised 600-700 lumen claim would require nearly 10 watts from the dyno.
You're confused by what I've said, my first dynamo light was 4x Cree XR-E and no way that is 1000 lumen, that would be total horsepucky. Cree XR-E is 7 years old and you'd have to drive them hard to get 1000 lumens out of 4.
My new 6x cree xp-g2 is 1000 lumens (not spec sheet).
It's not possible for led dynamo lights to be brighter than a 10w battery led setup unless the dynamo is driving 10w to the led, that means the dynamo has to be driving more than 5w to the leds.