Fenix

The Fenix TK15 is the big brother of the PD31's I reviewed recently and offers the same standards of construction but with considerably greater oomph.

Another general-purpose lamp that doesn't fall into the jack-of-all-trades, master of none category, 337 lumens is genuinely impressive (albeit not as powerful as some ultra bright bike specific rechargeable systems) but the switch on mine seemed prone to accidental engagement and the otherwise sturdy nylon bracket works best on stems with rises between zero and ten degrees.

The Fenix PD31 flashlight is one of those rugged designs for the great outdoors that happens to double as a really useful bike light. Fuelled by two little three-volt batteries, it'll pump out an impressive 304 lumens in turbo setting for about two hours but an aftermarket Li-on rechargeable type would be my choice, if used with any regularity.