Petzl Actik

Powerful but lightweight, the Actik has 350 lumens of white light available which will illuminate up to 80m.  Easy to use with a single button, it's got a wide or mixed beam pattern, three levels of brightness and red night vision modes, and a lock function.  It's also one of Petzl's HYBRID headlamps, compatible with the CORE rechargeable battery (sold separately). You can mount the Actik to your bike helmet or handlebars/seatpost with separately sold accessories, or use the Noctilight (also sold separately) to turn it into a diffuse light lantern.

Ouput: 350 lumens 
Weight:  86 g
Modes:  white (3 power levels), red (proximity and strobe)
Battery:  three AAA (included) or CORE rechargeable
Burn time:  120 hrs (lowest power), 12 hrs (standard power), 2 hrs (max power)
Weather protection:  IPX4