Join Date: Jan 2009
Location: Tri-Cities Washington
The guy is right... but he's talking light bulbs, NOT genuine HID's. I have two sets of HID's on the XK, and they're arc lamps - there is NO FILAMENT inside the bulb. The blueish color comes from the electric arc itself, and depends somewhat on the ballast supplying the arc as to their color output.
The best for night driving is 6,000 degrees Kelvin, which gives it a nice daylight output. You see 8000K to 10,000K all the time on converted vehicles, which does have the ''cool looking'' blue, but the higher the K number, the less they work in the real world of driving. The show-car purple is 12,000K to 15,000K. There's also 4,000K or 5,000K HID's which look more like halogens, but are still much better for night driving.
The PIAA's etc. are nice (albeit overpriced) bulbs, but are overpowered and then cut it back somewhat with the blue tint. They'd be illegal without the tint because of too much output. The idea is to give them an "HID look" without the HID installation hassle and price.
The problem: Blue tinted bulbs, or any bulb for that matter, lack the ultra wide spectral output, so they're never going to come remotely close to a true HID. Real HID's have an extremely broad light spectrum, so everything ''pops out'' from the road, whether it's wet or dry.
I think Silver Stars are the best because they are brighter and lack the light-cutting blue tinting. There's some purplish filtering like a camera lens to help it's output. But, they're still a long ways from a true HID.
Last edited by Adondo; 01-12-2010 at 02:23 AM.