I have a Shimano Nexus generator hub (DH-3N72) powering a Lumotec N2. It's been great. There is drag but barely noticeable, and the light is bright enough to be seen in the daytime.
Last night I made a small taillight - 3 red LEDs in parallel, and wired it parallel to the Lumotec.
Now there is a noticeable resistance when I ride. What's worse, the Lumotec is about half as bright as before.
Would a resistor between the generator and the taillight solve this problem? If so, what ohms?
Would using a single LED be a better solution, and if so, why?
I just pulled the LEDs out of my parts bin. No idea of their specs. I think they are maybe around 8 years old if it matters. All three are oriented the same way toward the circuit. That is, given DC they will all be either on or off, and under AC they flicker in unison.
I'd thought that since LEDs are so efficient, the difference in drag would be miniscule. I was quite wrong.