Sorry to bring back up this thread, but how have you found the longevity of these lights?
I had some fitted for just over a year now, same as tommyardin and slappy, much lower down mounted on top of the standard Yammy low engine crash bars. In that time, I've had no end of hassle with the bolt that goes through the supplied mounts and threads on the the alu body of the lights giving up leaving me with spinning lights that just fling to side to light up hedge row... Tried lock tight and all sorts, but ultimately the threads on the light bodies are shite. Swapped with longer bolts now with a nut on inside - bit of faff to tighten up, but held much better.
I've also had hassle with water ingress into the lenses, with moisture on the inside taking ages to dry out. Have to pop them open to clean and dry them out.
Mine also came with a handle bar mounted switch, and loom with relay. The switch has recently given up ghost, only turning them on if the rocker is in some half way state, where it never stays whilst riding.
They also have some weird flashing mode that you can activate by flicking them on and off quickly. But this always seems to get activated when you don't want it. Especially when the above switch was playing up and power was being cut intermittently.
I have to agree to think they do help with filtering, especially through winter and dusk/dark conditions. Definitely get the impression of more people noticing me, though these things are always hard to confirm, it could just be my perception. Now I'm in two minds as to bin them, try bypassing switch and hooking relay to side lights instead, or splashing out on new, better ones.