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Low‐dose upper‐room germicidal ultraviolet with eggcrate ceiling. Perforated ceiling tiles are removed to show two of the four 1.6‐W output UV‐C fixtures. Faint blue light emitted in the visible range from germicidal UV fixtures is seen near‐left and far‐right and ceiling fan blades are evident. Red arrows point to the bare GUV bulbs above the eggcrate.
