I recently acquired one of these Led Lenser H14 headlamps for use at work.
It comes with some great features, appart from being 210 lumens output 
Runs off 4 x AA bateries and reportedly last 90mins on full power (could get more from Lithiums obviously)
It is a multi use light with battery pack, ability for different ways to use it together with headstrap or without and comes with a bracket for handlebar mounting. Also has a few diferent light programmes with lower output, battery saving mode and strobe etc
I am thinking of adapting it to attach to the side of my helmet for emergency lighting in the dark if all turns to shite and my headlight is not enough.
I do have LED`s on the bike also for this, but thought it may be an option for others just in case of a late ride home (especially now that the days are short this time of year)
http://www.ledlenser.com.au/products/high-performance-line/h-series/h14/
Anyone already got a similar setup ??? :whistle: