File:Efficiency of lighting in the United Kingdom, lumen-hours per kilowatt-hour, OWID.svg
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![File:Efficiency of lighting in the United Kingdom, lumen-hours per kilowatt-hour, OWID.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Efficiency_of_lighting_in_the_United_Kingdom%2C_lumen-hours_per_kilowatt-hour%2C_OWID.svg/800px-Efficiency_of_lighting_in_the_United_Kingdom%2C_lumen-hours_per_kilowatt-hour%2C_OWID.svg.png?20200211190029)
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