I wondered if people replacing rear dynamo lamp with battery to avoid 'untidy' cabling from front dynomo would be interested in a small Mini 0.6Watt rear hub dynamo to save wiring to rear lamp and avoid bettery habit (other than perhaps battery standlight). Being low power it could perhaps be simple and light.
Curious that LED dynamo lamps are big and expensive: I would have thought even small cheapo rear dynamo filament lamps would have been replaced by a simple circuit of back to back zener voltage regulator regulator, 2-4 inverse parallel LEDS, 1-2 current setting resistors, or back zener voltage regulator regulator, diode bridgle 1-2 LEDS, 1-2 current setting resistors.
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Doubt if they'll ever make one as cheap and light as a couple of metres of wire though.