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This is the #3813 Thin Mirror S Rosco Fluorescent Lighting Sleeve/Tube Guard from Rosco. It is a reliable and cost-effective system for easy control of tough lighting scenarios - especially under fluorescents. In addition to the financial benefits of the sleeve, it protects against the potential disaster of glass shattering by containing the lamp within the end caps. T5 size tube guards contain a UV filter that minimizes fading.
Rosco sleeves are constructed of a solid polycarbonate tube within which is held the specific filter. This tube is not suitable for use with HO (High Output) or VHO (Very High Output) lamps due to excessive heat generated at the electrodes.