this B&M light:
http://www.rosebikes.co.uk/article/b--m-lumotec-iq2-luxos-u-senso-plus--front-headlamp-with-usb-connection/aid:620049
has the a capacitor so the lights stay on for a few minutes when stopped, and a usb output in the handlebar switch.
@M_A_X started
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this B&M light:
http://www.rosebikes.co.uk/article/b--m-lumotec-iq2-luxos-u-senso-plus--front-headlamp-with-usb-connection/aid:620049
has the a capacitor so the lights stay on for a few minutes when stopped, and a usb output in the handlebar switch.