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For general lighting applications, 70 % lumen maintenance, which corresponds to a 30 % reduction from the initial light output of a lighting system, is close to the threshold for detecting gradual reductions in light output. Research shows also that reductions to 70 % of initial light output are considered acceptable by the majority of occupants within a space. Thus, this level is unlikely to be problematic for a wide array of lighting applications. Indeed, lumen maintenance values greater than 70 % are achieved by most successful general light sources throughout their operating life.