If you're looking for a bright, well made and, erm, white light set then look no further: the Lunar 25 is about as good a commuting set as you're likely to find. The bright and well focused front beam is plenty to see by at night, and the 0.5 Watt rear flasher will render you visible at night from literally miles away. And both will light you up from the sides too, important for safety in town. You get batteries and good mounts for your money as well.
Blackburn’s aptly named fleas are one of the most exciting contingency LED lights I’ve used in a long time thanks to tiny dimensions, robust construction and a claimed output of 40 lumens each. Powered by a 1.5 volt rechargeable Li-On battery complete with a unique micro-charger increases the wow factor but charging from 1.5 volt AA batteries is a double edged sword: fantastic as you’ll find them pretty much anywhere but pricey if regularly charged from disposables.