I remember S2Ks have standard HID.
I saw some look like yellow but some look like blue or purple
why???

 

it depends on the angle you are looking at the headlights. the color changes a lot especially when you hit bumps on the road. the color can change from white, yellow to purple blue constantly. its just the nature of the projector housing design.

 

I've never seen yellow from HID projectors... only from projectors using regular halogens behind.. like Volkswagon and Saturn..

 

LOL!
THOSE ARE THE DAYTIME RUNNING LIGHTS or HIGH BEAMS!
for sure, HIDs, no matter what angle you look at them will never look YELLOW, it can look, blue, purple, and even greenish, but NEVER yellow ish, they r way too bright of a white, even if u put it in a yellow projector housing, it wouldnt look so yellow, it would be more whitish!

 

The color of light is determined by the color temperature. True white light is about 6500 degrees Kelvin. A lower temperature or warmer (sounds strange but it is true) produces a yellow light. A higher temperature or cooler will produce a bluer light. Standard car lights (and our high beams and/or Canadian running lights) are a lower temperature (warmer) and are more yellow. HID are closer to white (6500K) but are a little higher (cooler) temperature. I believe I remember some on posting that the color temperature was about 8000K for our HID's. We are so accustomed to seeing yellow (lower temp / warmer) headlights that the HID's appear to be more blue than they actually are.

 

actually the temp on our hid's are 4300k

 

All factory HID systems utilize 4300K HID bulbs which are the brightest available and mandated by DOT. Two types of bilbs are available, either D2S for projector beams or D2R for reflector housings. Also the higher up you go into the temperature range, the less light output you will get. 4300K is brighter than 6000K and so forth. I have seen 8000K HID systems and let me tell you...they are worthless!! They give out a constant purplish beam but you can't see a thing. That is because white light reflects off objects better than any other color light.

 

yellow???

 

Here

 

I noticed that the coolest looking HID's were BMW's and 2003 Range Rovers. For some reason, their HID are brighter and bluer. Has anyone else noticed this?