[Thunder_SS]

Actually that infor for HID lighting is a bit false. All lamps, incadescent, flourescent, or HID run on the same scale known as color temp and/or color rendering or CRI.

CRI is actually what you eye sees. On a scale based on 0-100, obviously 100 is perfect light. but very few lamps reach that ultimate 100 CRI, most fall well within a range of 60-90.

Color temp is actually the color base of the lamps. most of your household incadescent lamps run in the 3500 to 4000K range, which is a warm light or orangeish look. Most of the HID lighting like the headlights you are refering to are really a Multi-vapor metal halide, run in the range of 3000-4500K, which really is still on the warm side of the spectrum. You get the blue look because of the tint that is on the lamp itself. In order to get up in the 4000-5000K you are looking at flourescent lamps, SP41 has a cool white look to it, but this lamp only has a CRI of around 70. You can get a SPX41 that has a CRI of around 90 thou....but that will get spendy. Then there are some really fancy flourescent lamps called Chroma series, which has a 6500-7500K range, with a CRI of only 90.

So when you talk about Kalvins and CRI, you really need to put both in the equation to get a true reading on lighting.