My ideal light setup:
1) There are two aspects to lighting, being seen, and allowing you to see. The system should do both, but be able to switch between modes.
2) The system should always be there, without having to worry about recharging batteries, or changing batteries
3) To be seen, lights need to be bright, and to flash - this may be different in different parts of the world, but here in the US, flashing lights are needed.

My ideal:
A system which has a small, rechargeable battery which stores energy for the lighting system, and gets it charge from any of three sources: dynamo hub, solar panel, wall plug.
Will be able to sustain bright 'be seen' flashing lights from just the generator hub power (this is the minimum, always there system), while still allowing the hub to charge the battery in this mode.
Automatically adjust the front light pattern with speed - as you pick up speed, move the beam up, and make it brighter.

FWIW, my current lighting setup consists of a dynamo powered light set (Supernova E3 headlight, supernova tail light, schmidt hub), and a battery powered light setup - Dinotte headlight and tail-light. I wish that someone made a quality, generator powered headlight/taillight combo that had a flashing mode, but as far as I know- this doesn't exist.