Need info on Dynamo light

[richwolf]

I just ordered the PD-8 dynamo hub. My brother is going to make me a USB box to output power.
Are there any traditional lights out there that can operate at the same time they are plugged into a USB port for charging??
I was hoping one of the niterider lights like their lumina 650 might fit the bill but according to my friend when it is being charged by a usb charger the light will not turn on.
Any advice or feedback would be appreciated.

[find_bruce]

The problem you will run into is one of available power - USB charging was typically 5V at 0.5A & a dynamo is limited to 0.5A with traditional lights drawing 6V, giving you a choice of light or USB.

In theory you could wire the USB in series with the light, provided you are riding fast enough to generate 11V at 0.5A but that is not the way traditional lights are wired. The other issue is that, as I understand it, most USB devices are sensitive to voltage fluctuations.

Kerry from kLite is working on a USB pass through box which uses NiMH batteries to solve the voltage fluctuation issue & may be able to help you.