For long-term performance, PowerLightGuide all silica fiber optic bundles, fused-end bundles, and assemblies set the standard. Tested for well over 40,000 continuous, unfiltered hours, our PowerLightGuide bundles exhibit level, steady transmission at 95% of the original input! Traditionally, bundle transmission level has been limited by NA and the packing factor of the active fiber core area. However, in PowerLightGuide bundles, CeramOptec's Optran UVNS (UV Non-Solarizing) fibers are fused to eliminate inter-fiber spaces-without the need for epoxy and its inherent limiting properties. While maintaining the fibers' NA, CeramOptec's PowerLightGuide fused-end bundles typically increase transmission by 50%! Used in applications with temperatures as high as 1500° C, PowerLightGuides are the most advanced fiber bundles available today.