In reply to Blinder:
Have bought the 2200 lumen magic shine, used around 6 times so far, super bright light on full wack, nice neat head unit, battery pack is a bit of a monster.
I found that I could place the battery pack into my bottle cage on the road and then neatly wrap the cable up the seat tube and along the top tube.
on the mountain bike, I place the battery as low down the down tube as I can to keep the weight low
for £150, its a steal.
exposure are great lights, but anything with 1600 lumens plus is 1.very expensive and 2. its two big to sit on your bars.