Although a bit on the pricey side, the Urban Led rear light is easy to fit and offers plenty of visibility. There are four rearward facing LEDs and two side facing on each side. But where it really scores with the visibility rating is that the whole lamp body lights up red.
It’s a shame that the electronics are fairly simple though, meaning you have to run through all the modes to turn the light off. Still, it’s reliable and gives great visibility from all angles, and it’s easy and quick to fit with the simple rubber strap.