no bodys mentioned the light and motion 180 micro – its brilliant! usb chargeable in 3 hours, runtimes of upto 12 hours (i think)
http://www.merlincycles.com/bike-shop/lighting/bike-lights/rear-led-lights/light-motion-vis-180-micro-rear-led-light.html
cheap enough, has been used in -8 conditions, heavy rain, filthly mud, for hours and hours on end never missed a beat!
i sold my exposure flare for it, the flares good, but its too bright for me, its bad for people following me off road, this 180 micro is still bright, but not stupidly so…it has a good spread, and side amber lights that give off a wider pattern, and believe me although not as in your face bright as the flare, its still bloody bright! it has 4 power modes too with pulsing etc, so not always either on/off
i cannot fault it at all, its the smaller version of the light and motion 360 – which im guessing is pretty amazing given the quality of my smaller model, pricey mind the 360 version at about 90quid