Apparently, “in homes and offices from 20 to 50 percent of total energy consumed is due to lighting.” In addition, “a single 100 W light bulb used just 6 hours a day can cost over $25 per year to use (.12/kWh).” Though this isn’t an EXACT answer to your question, you can definitely see how much energy lighting uses up, especially in large office buildings where energy consumption is ridiculously high.
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