UV AND NEAR VISIBLE LAMP FILTER

摘要

A lamp (10) includes an envelope (12) and a source of illumination (22, 24, 26) disposed within the envelope. The source (22, 24, 26) emits radiation at least in the ultraviolet and visible regions of the spectrum. A film (30) is disposed around the envelope to block the transmission of substantially all light emitted from the envelope in the UV range and below a selected wavelength in the visible range, the selected wavelength being above about 450 nm. The film transmits substantially all visible light above the selected wavelength. The film includes a polymer matrix and a blocking material dispersed in the polymer matrix. The polymer matrix and blocking material are stable at lamp operating temperatures of above 100<SUP>0</SUP>C.