G
I've got a SON hub dynamo on the Brompton together with a B&M toplight
plus on the rear and lumotec round plus on the front (although the
standlight on the front no longer works)
But the 2.4W bulbs on the front keep blowing (I typically seem to get
about 30-60 hours of use out of a bulb) and because this is Central
London I don't necessarily notice straight away that the bulb has blown
(which is how the standlight got destroyed)
I've wired two 8v6 zeners across the dynamo. That seems to have saved
the rear light but didn't save the standlight.
My average cycling speed is probably around 20mph (hard to be certain
because of all the stops at traffic lights) with a peak speed of about
30mph. Would this be tending to overvolt the bulbs (the zeners should
start to clamp as the voltage reaches 6V RMS but obviously I'll be
getting about 9V RMS if the output becomes a square wave)
Are there any other light options (LED?) that won't have this problem?
I use the front luggage so there isn't a lot of room and I don't think
"Busch and Muller DLumotec Oval, the new LED front lamp" will fit.
Or should I be using 3W bulbs even though I've got a rear light? (Off
to buy some bulbs now and I'll get a 3W bulb to give it a try as I've
run out of 2W4 bulbs except for the one that is now in the light)
Tim.
plus on the rear and lumotec round plus on the front (although the
standlight on the front no longer works)
But the 2.4W bulbs on the front keep blowing (I typically seem to get
about 30-60 hours of use out of a bulb) and because this is Central
London I don't necessarily notice straight away that the bulb has blown
(which is how the standlight got destroyed)
I've wired two 8v6 zeners across the dynamo. That seems to have saved
the rear light but didn't save the standlight.
My average cycling speed is probably around 20mph (hard to be certain
because of all the stops at traffic lights) with a peak speed of about
30mph. Would this be tending to overvolt the bulbs (the zeners should
start to clamp as the voltage reaches 6V RMS but obviously I'll be
getting about 9V RMS if the output becomes a square wave)
Are there any other light options (LED?) that won't have this problem?
I use the front luggage so there isn't a lot of room and I don't think
"Busch and Muller DLumotec Oval, the new LED front lamp" will fit.
Or should I be using 3W bulbs even though I've got a rear light? (Off
to buy some bulbs now and I'll get a 3W bulb to give it a try as I've
run out of 2W4 bulbs except for the one that is now in the light)
Tim.