On 23/07/2019 19:50, Terry Casey wrote:

snip

I recall an article in Elektor magazine a few years ago which
used them in conjunction with a cycle dynamo lighting system
so that when the dynamo voltage dropped, the supercap turned a
pair of high efficiency LEDs until the bike moved again.

Yes, a clever idea. A bridge rectifier made from LEDs was driven by the
dynamo with another LED and supercap on the bridge output providing the
backup.

Cheers
--
Clive