Buy a fancy 5-year eco-lightbulb for $9.79?
Or pay 70 cents per lightbulb, but replace them every 5 months?
h/t @mrvaudrey
Whichever answer you choose, please justify your reasoning using mathematics.
2 thoughts on “Would You Rather…”
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And …. CFL bulb uses 24 watts, regular bulb uses 100W
Cost of electricity is $0.13 per kilowatt-hour.
watts/1000 = kilowatts.
kilowatts * hours on = kilowatt-hours
So 100 watt bulb left on for 12 hours per day would be 1.2 kWh which would cost $1.56
i would prefer regular bulbs over the eco bulb because its a dollar cheaper for each 5 years