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Since fluorescent lamps have such a long life compared to incandescent lamps, eventually the brightness (lumen output) of the lamp will begin to decrease. Because of this, fluorescent lamps have an initial lumen rating and a mean lumen rating. The mean lumen output is measured at 40% of the lamp life. NOTE: Decorative or colored bulbs do not have a lumen rating since they are not considered a primary source of lights, only decorative.
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What is the mean lumen output of a fluorescent lamp, and how is it different from the initial lumens?
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