With cycling safety in mind, I bought a pair of low power red LED ... Flashing is legal these days, so they will be flashing. However, a flashing load might modulate the headlamp, so there has to be ...

Note, there is a flasher version ... This is the basic idea of the circuit My cunning idea (now proved to be not-so-cunning) was to have constant current supply to a capacitor and load it with an ...