PIAA Hyper Arros Headlight Bulbs offer clear bright white 3900K light, with up to 20% additional light over. They are designed to offer a balance between visiblity and lifespan.Cool white 3900k light20% extra light on the road over stockPIAA Hyper Arros Headlight Bulbs are designed to give you more light and whiter light than your stock bulbs.The light on offer is 3900K which is clear, white light. This range of light is probably the sweet spot for visibility. Whiter light is easier to see by which will reduce eye-fatigue when driving at night.These bulbs offer up to an extra 20% light on the road when compared to most factory bulbs. The farther you can see, the sooner you can react to hazards, and the safer you are.