QUOTE(MButkus @ Apr 16 2008, 07:55 PM)
The reason behind HID is their low amperage to run them. Hence they don't need relays. The relay is for poorly made wiring and higher wattage bulbs. Running a short 12v wire directly from the battery to the higher wattage headlight does not let the voltage drop to the headlight that some suggest. If you read the HID instructions, it works from 9 to 12volts. It kicks the voltage from 12 to some 30K. Besides, when your car is running, you are running at 13.8 volts anyway. I have HID on my low and high. HIDs should not come on instantly. The bulb has to heat and there are a number of safety features that do not provide the full voltage for some 10 seconds. My lows are 4500K, they turn on blue for about 45 seconds until they warm. Then a nice white. They were really worth the $90.
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That's helpful... thanks. You do mention that relays are for higher wattage... if these new fog HID's that I'm about to install are 35W, rather than 27W as the stock ones, wouldn't a relay be mandatory?