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![Luminous efficacy [lumen/watt] of all lights included in the test sample. | Download Scientific Diagram](https://www.researchgate.net/profile/Edwin-Wiggelinkhuizen/publication/228904625/figure/fig1/AS:341309635219456@1458385966148/Luminous-efficacy-lumen-watt-of-all-lights-included-in-the-test-sample.png "Luminous efficacy [lumen/watt] of all lights included in the test sample. | Download Scientific Diagram")