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Luminous efficacy and efficiency, explained by RP Photonics Encyclopedia; light source, incandescent lamp, LED, energy efficiency
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Bioluz LED 92 CRI Dimmable Edison Light Bulbs 800 Lumen Warm White 2700K 60W Replacement ST64 / ST19 / ST58 8.5W E26 Standard Base Title 20 High Efficacy Lighting 6-Pack - - Amazon.com
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