What type of headlamps are these?

I%26#039;ve seen cars and suv%26#039;s with HID%26#039;s that depending at what angle you are looking at them they change color. They go from a Blue to Violet to White. I%26#039;d like to buy these for my pick-up, What type of headlamps are these? I think its projector headlamps but i%26#039;ve seen some cars with these lamps but they dont have that effect where the light changes color.. Is it the light bulb? |||They are the higher end projectors. They are made with a different kind of glass/crystal combined with an HID bulb. Just because it is a projector housing, doesn%26#039;t mean it has an HID bulb. Also it needs to be a 6000k HID. The 8000k and up is to blue for the projector to defract the light.