as stated: 4300k is what All OEM's used. This will give you the most light, period. As you go up in k, the light output goes down. There are 6000k bulbs made by some of the OEM manufactures, but thats the highest you can go with you getting some type of shitty korean/chineese kit.
Being some one who has messed around with HID's a ton, I'll post my input.
Non projector HID setups do not hold a candle to a proper projector HID retrofit.
My experience has been with tons of cheap plug & play kits, the now out of production Sylvania h0654 kit, and retrofitting my Lexus with OEM projectors. My wife also has an 01 audi a6 for me to compare my retrofits to a OEM HID setup.
With the cheap plug & play kits that use a stock style halogen housing, you're going to blind on coming traffic no matter what.
With a kit designed to use a hid bulb in a refelector style housing, and using a glare shield, you can get acceptable light output and cut off. I don't know weather this kit has a HID bulb shoved into a non HID housing, or not, but the sylvania kit had the shield, and was designed for HID bulbs and it still wasn't perfect. There were a couple hot spots making lighting not optimal, and the cut off wasn't perfect. These would work, but I wouldn't pay 500$ for them again.
Using an acura TSX projector, and genuine OEM phillips ballasts, HID's are amazing. Good cut off, good light dispersion, no blinding on coming traffic, these make drving in the back woods roads to my house at night not a chore. They were as good or better than my wifes A6 hid's from the factory, with the fact that she has auto leveling built into my car, and I have to adjust mine when ever I put a big load in the back. I also spent tons of hours (30 give or take) retrofitting the projector, cleaning up my headlights, ect and 6-700$ in used parts (Projectors, ballasts, and bulbs were 500$ off ebay).
I also would not bother running anything but the trigger from the stock wiring. Most HID's can pull too much current on start up for the stock wiring to handle. I put 30amp fuses, and 40/50 amp relays, 12 awg wiring on each ballast on the retrofit I did. Anything worth doing is worth doing right.
My justification for doing good HID's the right way, was that silverstar bulbs cost a ton these days, 20-30$. I was burning them out every 4-6 months. That adds up after a while , and the average HID bulb from a good OEM setup (Phillips, Sylvania) will last 8-10 years of average night driving.
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