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Why does the set pictured in the first link come with ballasts? LEDs don't run on thousands of volts like HID does, so it would be unnecessary.
That said, I just replaced my halogens with a cheap $40 HID kit on Amazon, and I'm very happy with the results so far. The housing was already a projector style, so the beam is very well controlled, and nobody has flashed me for blinding them. I measured the energy use at 40 watts, which only saves me 15 watts, but it still gives me much more light.
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