I never had dyno until 2020, and now I have it on my 2 bikes. 

1. 52 cm Clem L with 650b wheels: Shutter Precision hub with Edelux II 
headlight and fender mounted SON taillight 

2. 55 cm Platypus with 700c wheels: Schmidt SON hub with Edelux II 
headlight and fender mounted SON taillight.

So: same lights but different generators.

SON has the votes for best dyno ever, so I went with that for my Platy, but 
so far, it's not been as good as the SP. I know that cannot be, so 
something must be wrong with my setup of the SON, or possibly the 
hub/generator itself. I think it has been this way from the start; I always 
thought the differences were due to the mounting location of the light.

We had both bikes out on a family ride and the Clem's light was blindingly 
bright - a veritable floodlight. The Platy's light appeared dim in 
comparison, even though I was riding the Platy at a faster speed. The 
Platy's rear light often flickers unless I am riding downhill, and the 
Clem's does not. I've checked the connections and as best as I can tell, 
there's nothing amiss. The Clem's headlight is front rack-mounted, and the 
Platy uses a fork-crown mount. I did a night ride with the Platy last night 
and was really underwhelmed by the beam. It is not the beam is blocked; it 
appears the light is just generally dimmed.  I ride a dark path through the 
desert where there is wilderness on one side and homes distantly located on 
the other, no streetlights. I need good illumination; the Clem gives ample 
lighting but I feel like I'm straining to see on my Platy..

Secondly, I hear something in the drivetrain or wheel set of the Platy. 
Almost like the sound of electrical current. It is only on the Platy, never 
the Clem. I have heard that the SON is supposed to be silent, but there is 
definitely noise coming from the bike, but I don't know if it's the hub.

I'm going to take the bike to the shop that built it and see if they can 
figure out the noise and the dim light. If you have any words of wisdom or 
direction I could point them in, please let me know here. 

Things I have considered:
1. Does the wheel size affect the difference in brightness? 
2. Does the mounting location affect the appearance of the beam? (I have 
tilted the Platy light this way and that so the beam doesn't fall on the 
front wheel, but no real difference was noted.)
3. Maybe there is some tension on the wires somehow?

********************************************************************
Don't read past here if you don't want to be subjected to my angst. It is 
cathartic to talk to bike people about bike woes; no one else understands.

I dread taking the bike in and presenting them with some obscure issues 
(What is this noise? Don't you hear it? Well, it's not doing it right NOW, 
but... My light is not bright enough! Can't you make it brighter?!) Most 
shops in Vegas don't know a thing about dyno; it took my LBS considerable 
time to suss out how to do it. So, I fear that the bike will come back to 
me in the same state and I will be slowly driven crazy by the sounds and 
the inferior lighting. Also, the Platy is special and I am overly attached 
to it. When things aren't right with it I am all sackcloth and ashes, 
wailing and gnashing of teeth over here.
*******************************************************************
Thanks for your insight!
Leah

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