Got a bulb out? Looking to replace your factory HID bulbs with a new whiter color? Don't, worry our ARC series bulbs will get the job done. Their brilliant crystal white 6000k color temperature provides the ideal combination of excellent visibility and aesthetics. Why don't we carry any other colors for automotive use? Two reasons: 1: We hate yellow headlights, 2: We hate blue headlights. Yellowish HID headlights that resemble halogen bulbs don't offer the distinct crisp look of a pure white light. Blue lights are highly illegal, AND they do not offer proper road lighting. The human eye is far less sensitive to blue light than it is to white light. This in both cases, 6000K wins.