Well, you need a question mark instead of four exclamations in the title, but I couldn't imagine a 3A headlamp in place of a 5.5A one would create any problems bigger than a "bulb out" warning light. Maybe some HID makers install a resistor to draw extra current, but I doubt it. Write to the manufacturer you're thinking of buying from, then post their response here. I do know the fancy headlamps on the Prius draw less than 55W, which proves that such lamps are out there.
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