CatEye’s HL-EL520 combines one high power white LED with their exclusive OptiCube technology to produce more than 1800 candlepower. This was certainly evident when cycling at night. It is perhaps more than 3 times power of my Brompton battery light set.
It isn't the brightest battery light that CatEye produce but it was the one for me as it is sleek and fairly compact. It is also waterproofed well and towards the end of Saturday's ride it rained a fair bit and all was okay.
The compact design features side visibility, high and low beans, and up to 150 hours of runtime on 4 AA batteries. The simple, tool-free FlexTight mounting bracket allows you to quickly and easily attach the HL-EL520 to virtually any handlebar.
Yes it is bigger than my Brompton front but it still fits on to the from handlebar comfortably.
I bought this from Evans Cycles with a small discount and the retail price was £44.99. The battery life is excellent and although it has two settings, there is little difference between them. I have some rechargeable AA batteries and will almost certainly use them to power this. There are lights that have their own separate battery pack which produce a brighter light but for the moment it is a pretty good light and I am more than happy with it.
Dimension： 101.0 X 44.0 X 46.0mm
Weight： 185 grams (with bracket and batteries)
Light source： 3 watt white LED X1
Light output： 1800+cd
Battery： AA alkaline battery X4
Runtime： Approx 75hrs in high mode and 150hrs in low mode