Up to 80-percent brighter than standard headlights, the Eiko H1042CVSU2 ClearVision Supreme is a quality performance headlight for your vehicle. At 42 watts, this lamp has a lumen output of 840 and an average lifespan of 775 hours. Designed to easily replace your existing bulbs, this lamp uses a T-4 bulb and a right-angle H10 (PY20d) base. Since this 4100K color cool white light is brighter than normal, it's shielded to protect oncoming traffic from being blinded by the powerful light. With impressive longevity, this bulb will last for many miles through many weather conditions.