The Big Bang is unique amongst high output lights in that it is designed for both road and off road use.
The unique relector surrounding the H.I.D bulb spreads the light in a way that does not dazzle oncoming traffic making it safer for all concerned.
Normally this beam pattern would make the light compromised for off road use, but the Big bang simply uses a clip on diffuser to spread the light evenly making it one of the best off road light available.

• 140 lux output at 10m distance
• 5 hour burn time
• 2.5 hour charge time
• 31.8 handlebar clamp included
• Two cable lengths included
• Lithium-Ion battery pack
• LED battery level indicator

Special recommendation by Cycling Plus magazine, December 2007 issue.
Have a look at the beam pattern shot here:
http://www.bumm.de/index-e.html