Dear,we are a professional and responsible factory. First of all, you want the sample, there is no mandatory requirement to have UL label on the product. We believe that the sample is the confirmation of the appearance and quality of the product before the mass production. We are confident that there is no problem with the products of our factory. Second, you said that you need the UL label to show the lamp to the dealer, and you want to replace the installed parts, so we send free replacement and free shipping for you again. Third, a year has passed. You told me one of the lights didn't work.But you didn't send us a video of it not working. And you know, this is an led light source, and unlike a light bulb, it will cause burn out and not work as long as it is used beyond the specified voltage.

Thank you for your generous praise.Please feel free to contact me for the inquiry of lamps, no matter wall lamp, table lamp, pendant lamp, floor lamp, ceiling light, welcome customized.We will continue to provide you with the best service and lowest price