We provide 1 year Warranty for the HID Xenon Conversion Kits, HID replaced bulbs and ballasts, And for the Light bulbs other than HID , the warranty period is 30 days, and we test all bulbs before shipping, so please buy with confidence, but if the bulb is defected or damaged during the shipping , please contact us at once, and we will send you the replacement (not due to misuse). If you find your item out of order(not due to misuse), please contact us for the replacement before return us the defective item. We will send you the replacement as soon as possible. Buyer required to pay all shipping cost. Shipping and handling charges are non-refundable at any case. All defective items must be noticed within 7 days after received.