Join Date: Jun 2010
Location: NW,Oregon Coast
back in the day there were just Incandescent bulbs .. and the wattage split the power output [6 volts
3 watts total] ... 2.4 w load in front 0.6w in the back , if a headlight only . the bulb has to be 6v&3w
Now a days the brighter LEDs put out Heat, and so need a heat sink to have any longevity..
that is in the design of the headlight unit as a whole..
FWIW, IDK even if the output on those old hubs is DC or as the newer ones AC, alternators.
to know .. access an Oscilloscope, and watch the display. http://en.wikipedia.org/wiki/Oscilloscope
either its a line or a wave .
I'm thinking they are flashlight bulb LED substitutes, in that situation
the battery power out put is DC and does not spike with speed changes
but declines steadily as the battery is drained ..
Last edited by fietsbob; 01-15-14 at 02:27 PM.