This headlamp has a removable Bow Light that can be mounted on the front of your kayak. So far I am impressed with the Illumarine H2B system.
Batteries used in the H2B:
Head Bow Light: Powered by 2 N Cell Batteries
360 degree Top Light: Powered by 2 2032 coin cells
Cockpit Light: Powered by 3 AG3 button cells
For more info and price go to: http://www.headtoboat.com/
Additional Videos of the H2B: