Moon Unisex Adult X-Power 1800 Front Light - Black.

This is a great light that is simple to use and provides plenty of light for me to ride at night where there is no street lighting. The battery pack straps to the cross bar and there is enough cable (not too much and not too little) to have the light on the handle bars. Simple to change the brightness even with thick gloves on - which stops you blinding on-coming traffic/people and lengthens the operating time.