There were a few candidates- my Tacx Spider workstand

was certainly in the running, as was my Altura Airstream jacket but for me, the hands down winner was my Exposure Joystick light-

(mine is red by the way).
I wear mine on a helmet mount-

This light is the dogs wossnames. it is light, bright, rechargeable and cable free. I have mine on the helmet because it gets me noticed. I have it on flashing mode and this seems to get noticed as it is higher than the general background clutter.
They can be a bit pricey but, if you are looking for really good lights, the Exposure range is well worth a look-
Exposure lights