As above, need to be able to remove it from bike pretty quick/easy.

Lezyne lights are fantastic quality, easily removeable and in tests often come up brighter than their quoted lumens.

http://www.wiggle.co.uk/lezyne-power-drive-xl-front-light-1/

A road light or an offroad light? Already got any? (reason I ask is that I’d probably rather get 2 cheaper offroad lights than one better one)

buy my glow worm x2 thats for sale in classifieds 😉

Front or back?

For seeing or being seen?

Try the KK-Lights on amazone. They’re very cheap copies of lumicycle lights.

Front for seeing

SolarStorm U2 off EBay and a Smudge battery?

candbseen 1200 lumen jobbie with the uprgaded heavy duty battery.

More than enough light for anyone

I got a set of two cree led lights off ebay (about £20)for the commuter bike, swapped them onto the mountain bike as better than the Hope one I was using!
The batteries last longer and the brackets dont break every couple of weeks like the Hope ones where.