On my better lit bike, I have the following...
Headlights:
on helmet
NR MiNewt X2
on handlebars
NR MiNewt X2
NR Wireless TriNewt
CatEye EL400
NR Evolution Smart (was off when I was hit)
Tail lights:
on helmet
PB Blinky 3H
on backpack
2x Perfomance ViewPoint Flashpoints
PB Superflash
on bike
PB Superflash
NR Universal Tail light.
Ground Effects:
All that, and I've got it covered in 3M Scotchlite RR film...
And I still got hit (left cross) by a car, after dark, while I had my lights on... His excuse... "Oh My God! I'm so Sorry! I didn't see you!" (my leg was broken in two places, and I had a torn MCL).
IMHO, you cannot have enough visibility, unless you can somehow project a moving hologram of say a T-Rex, a Jumbo jet, or manage to somehow blister paint.
Rubberside Down!
K'Tesh