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How many units of power does a LED bulb consume in 12 hours? - Quora
kW vs. kWh: How much energy is my lighting using? [Calculator]
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LED lamp - Wikipedia
LED vs. regular lightbulbs: Do they really make a difference?
Do High Power LED Bulbs Save Money?
LED Light Bulb Energy Calculator: Watts and kWh
Swap Your Conventional Light Bulbs for LEDs at No Charge! | Sustainability | Washington University in St. Louis