[RedDevil]

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I can only recommend replacing the low beams with HIDs. That should save you about 3 Amp on their use (assuming 35W HIDs versus 55W Halogens). And as the HIDs have their own power regulators, a drop in voltage to 12V will have no effect on their brightness.

You would need to use the high beam less often when you have HIDs too. They are about 3 times as bright despite their lower power consumption. You can see the road about 50% further ahead in the dark.

The ecovisions are about 35% more effective than standard. Nice and well.
HIDs are about 400% more effective though. They beat anything, even LEDs and CFLs.

Need to add that my Insight has low beam lenses with produce very little stray light, so at night other road users seemed to overlook it coming from aside (no running lights in European Insights too...!).
My cheap aftermarket HIDs solved that problem, helped by the now very brightly lit area on the road ahead of my car of course.