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Lumen maintenance is the most useful gauge to determine the lifetime or useful light output rating of an LED light source. Unlike traditional light sources such as incandescent lamps, LEDs rarely fail outright and instead continue to emit light, albeit at slowly diminishing rate over time. [ 1 ]
The lamp was comparable to a 60W incandescent in color quality (CRI = 93, CCT = 2727 K), light distribution, and light output (940 lumens) but consumed less than 10W (a savings of 83%), and at 25,000 hours of testing, the actual lumen maintenance was 100%, with chromaticity change at less than .002. [1]
LED life span as a function of lumen maintenance drops at higher temperatures. Thermal management of high-power LEDs is a significant factor in design of solid state lighting equipment. LED lamps are sensitive to excessive heat, like most solid state electronic components.
The bill established a minimum standard of twenty-five lumens per watt by 2013 and sixty lumens per watt by 2018. [102] [103] [104] The California regulations were challenged in court by light bulb manufacturers upon the US Energy Department's action reversing the 2014 regulation that would have taken effect on 1 January 2020. [105]
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Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.
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