this cerium-added quartz tube can effectively prevent all radiation of uv-b and uv-c ultraviolet and most radiation of uv-a ultraviolet .it is the best materials to prevent uv with best transparent performance. it can be used to make quartz halogen lamp , gas discharge lamp and other uv lamp-house , which will effectively protect human and object from hurt of ultraviolet and maintain the best efficiency of light transmission. lianyungang granhtquartz factory