I’ve been using a Light & Motion Vis360 for the last couple of years:
It gets my vote as the best commuting light set out there, and in ten years of commuting…I’ve tried them all.
Advantages:
1. It combines both front and rear light.
2. It attaches to your helmet. Hat on, off you go!
3. No fiddling around in the dark attaching / removing your lights on / off your bike.
4. Your lights will never get nicked (They stay on your hat).
5. One switch controls both front & rear lights. Three modes, On high, On low, & Flashing.
6. In-built battery, charges via USB lead. (Also has on-board battery status indicator – tells you when you need to recharge).
7. The lights are up on your HEAD, where they can be seen by more traffic than low-mounted lights attached to your bike. (Can the guy four cars back see the light mounted under your saddle? Probably not. He can definitely see your head though).
It is as bright as you will ever need it to be for commuting (Dont be fooled by manufaturers claims of ‘lumens’, as they are pretty meaningless for commuting). The aim of the game for commuting safety is to BE SEEN by other traffic, it is not necessary to light up the horizon with mega-lumen searchlights…
Making yourself seen in traffic, has more to do with where you position your lights, rather than how many lumens they have.