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Where are you finding those prices. I thought I did well getting a 150Watt equivalent today for $7.95 at Target (down from $11).
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4-pack of 100W equivalent for $7.58 ($1.90 ea):
Great Value CFL Light Bulb: 23 Watt (100W Equiv), 4-Pk - Wal-Mart
6-pack of 100W equivalent at Wal-Mart for $15 ($2.52 ea):
Walmart.com - Always Low Prices! - GE CFL Light Bulb: 26 Watt (100W Equivalent), 6-Pk
6-pack of 60W equivalent for $9.88 ($1.64 ea):
Walmart.com - Always Low Prices! - GE CFL Light Bulb: 13 Watt (60W Equivalent), 6-Pk
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In my experience, a good CFL will outlast more than 8 incandescents; I've had a CFL on my porch going on 6 years...6 years of 100 watt incandescents at 3-4 a year comes to 18 to 24 bulbs.
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A disabled friend of my mom's, an AF vet, I picked up six CFLs for him in July 2004 so he wouldn't have to get up on a chair and change his incandescents which frequently burned out because of the electrical in his apartment. Of these, four he never turns off (100w equiv).
The first one of those four burned out in September 2007, after about
27,000 hours of use. The other three are still good, and have clocked up
over 30,000 hours, as are the ones in his desk lamp and bathroom.
Back then, CFLs were rated at around
8000 hours... if not less. So they have lasted over three times their rate life, and three of them are approaching four times their rated life.
At the rated life of the incandescents, he would have had to install
117 to 156 incandescent bulbs during this time frame.
At 50 to 75 cents apiece, that's
$59 to $117. Truth be told, they burned out more often than that. And instead of installing 117 to 156 incandescents (in his case probably over 250 purchased at a gas station), he's had to install 1 CFL.