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LED light bulbs
Mar. 16th, 2008 03:41 pmI just checked into LED bulbs for the house. They use less energy, last longer, but cost more. I looked at 40 watt floods.
An incandescent bulb costs $4 for a pack of four, but they only last a year and a half. LED costs $60 a piece, but last (reportedly) for 25 years. The LED equivalent to the 40 watt uses 2.5 watts.
So 6 hours a day at $.1176 kWh for a year costs $10.30 a year for a 40 watt incandescent, and $.64 for 2.5 watt LED bulb.
But what about the bulb cost? If a regular bulb costs $4 for four and lasts a year and a half, that's 66 cents a year. At $60 for 25 years, that's $2.4 a year for LED.
Add those costs together, and incandescents cost $11 a year, while LEDs cost $3.04. Even if an LED only lasted ten years, that's still only $6.64 per year.
An incandescent bulb costs $4 for a pack of four, but they only last a year and a half. LED costs $60 a piece, but last (reportedly) for 25 years. The LED equivalent to the 40 watt uses 2.5 watts.
So 6 hours a day at $.1176 kWh for a year costs $10.30 a year for a 40 watt incandescent, and $.64 for 2.5 watt LED bulb.
But what about the bulb cost? If a regular bulb costs $4 for four and lasts a year and a half, that's 66 cents a year. At $60 for 25 years, that's $2.4 a year for LED.
Add those costs together, and incandescents cost $11 a year, while LEDs cost $3.04. Even if an LED only lasted ten years, that's still only $6.64 per year.
