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These shields convert a standard 40 w florescent light fixture into a safelight. The 0C sleeve can be trimmed to fit any size florescent bulb up to 48" long. The filter sleeve can be used in single or double fixtures. The BrightLab Red Florescent Safelight Shield with end caps is safe for use with most black and white contact and enlarging papers, including all poly contrast Ektalure, Ektamatic, and all resin coated and silver papers. This filter shield converts any existing florescent fixture into an economical safelight.