Honestly, I'd use as many LEDs as you have - I have 10 rear LEDs (all blinking) in two lights and up to 9 front ones if I wear my helmet light (6 blinking, 1-3 solid, 3 lights/) I get compliments on my visiblility from people all over - peds, other bikers, people in cars (yes, they've stopped and asked about the lights, or just slowed to tell me 'Thanks for being easy to see!')

It may be against the laws (though I really doubt it) but the thing is - you need to worry about the laws for something like lights after an accident. If the problem is that you were OVERlit, I have the feeling that a judge would overlook anything you were doing that's technically illegal.

Also, the actual wording of the law doesn't actually exclude more than one light. Actually, it sounds like you could have at least two lights - one 'in addition to' and one 'replacing.' But it doesn't say 'No more than two lamps can be used.'

Then again, I'm just drunk typing on bikeForums at 2:30am...