Rear lights - someone else's bright idea
I rode behind someone on the way back from a rally (in daylight) and noticed that his rear end lit up like a Christmas tree (no jokes please) when he braked, despite his having a Miller rear lamp. I was so impressed I 'phoned him later to find out how he did it.
What he had done was 1) realised that LED bulbs are very directional, so hacked a reflector about to fit inside the Miller shell and scatter the light, and 2) stuck an LED strip (bought from Halfords or Autoparts) just aft of the tool tray under the seat as an additional stop light.
There isn't much room on the Miller shell, so I'm still puzzling out how to keep the lens and "grille" in place. However, the reflector business turned a pathetic light into a serious contender for modern lights, so that's the direction I plan to go.
There's probably a technical explanation for the directional effect of LED's, but I've noticed that LED torches (which I use to augment garage lighting) aren't as effective as conventional torches. Anyone know why?