How Much Does LED Lighting Cost to Run? How to Calculate the Cost of Leaving It On for One Month
"The brass light is so beautiful that I'd like to leave it on all night, but I'm worried about the electricity bill..." We sometimes receive comments like this. This time, let's actually calculate the electricity cost of leaving an LED bulb on for one month.
Calculation Conditions
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Bulb used: 4.4W LED bulb (equivalent to a standard 40W brightness)
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Electricity rate: 31 yen/kWh (guideline rate set by the Fair Trade Council of Household Electric Appliances in Japan)
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Lighting time: 24 hours × 30 days (total 720 hours)
The surprising result is...? 4.4W ÷ 1,000 × 720 hours × 31 yen ＝ Approximately 98 yen
Surprisingly, even if you leave it on 24 hours a day for one month, the electricity bill is less than about 100 yen. If it is lit only "during the night (8 hours)," it is one-third of that, about 33 yen.
How does it compare to incandescent bulbs?
If the same brightness were lit with an incandescent bulb (40W), leaving it on for one month would costabout 892 yen. Just by switching to LED, the electricity bill is reduced to about one-ninth.
Here's the point!
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Effective as a crime prevention measure: Once you know that "the electricity bill is low," you can leave the lights on at the entrance or living room when you are away or sleeping as a "crime prevention measure" without burdening your household budget.
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Long lifespan also reduces costs: LEDs not only save on electricity bills, but the lifespan of the bulb itself is about 40 times that of incandescent bulbs (about 40,000 hours). Including the hassle and cost of replacement, it boasts overwhelming performance.
■ The luxury of your favorite "night light" In the middle of the night, when you suddenly wake up, the faint brass light in the living room. The wonderful thing about modern LED lighting is that you can incorporate this "peace of mind" into your daily life without worrying about the electricity bill.
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