Seen here "Together at last? Bike lights and a cable lock":
"... combines a headlight and tail light with a 6-foot (1.8-m) coiled steel cable lock."
The two lights are permanently attached to either end of the 9-mm-thick cable, and sit on quick-release mounts on the handlebar and seatpost when the bike is in motion. When it's time to lock up, they come off, and a sliding steel barrel lock on the cable is used to secure it around an adjacent immovable object such as a lamp post or railing.
On Kickstarter site:Both lights are IPX6 water-resistant (they stand up to heavy splashing and rain) and are electrically-linked by the cable, with one charge of the single lithium-ion battery being good for seven hours in steady mode or 14 when blinking. The headlight kicks out 200 lumens, while the tail light is rated at 30.
https://www.kickstarter.com/projects/80 ... ike-lights
$4,524 pledged of $39,000 goal
20 days to go