Andre Jute wrote:

My experience is that Shimano dynamos, of which the -72 was once the most desirable model, come up to maximum output faster than SON dynamos, that is, provide a steady, useful light at lower speed. So if you see flickering at low speed with a Shimano hub dynamo, you're overloading it.


I believe you've hit the nail on the thumb 8-)

A DPST switch wired to shunt one LED in each branch is probably the
simplest fix. That'll give better light at low speed. The flicker
is useful during the day and tolerable over about 10 mph at night.

Thank you for writing!

bob prohaska