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To use the "storage effect" of the capacitor you need to convert to DC. It seems like the LEDs you've linked to work as a drop-in replacement for the bulbs (on the AC dynamo circuit) so you're going to have to add more electronics.
Can reply more when I get to work, these links are hard to read on phone
yoshy
russmeyer
Can anyone with a better grip on electronics than me help please. Rebuilding an old bike and installing a SA x-fdd dynohub with standard 6V/3W AC output. Plan is to keep the old lights but replace the bulbs with LEDs from bikeco. I'd also like to mount a switch in the front light, sort of like this
and ideally a capacitor to get standlight function. What should I look for, I'm thinking the voltage/amps output of a dynohub is pretty puny and it would be possible to get a switch with too high resistance for proper light function? And what numbers should I look for re the capacitor??