I have two lamps on the porch and each has three candelabra cartridges. I leave the porch light on all night. Before I bought these bulbs, I had to replace one in every six bulbs every few weeks. It was a constant problem. Ordinary candelabras don't last very long if they're left on 10-14 hours a day. The bulbs I used were 7 watts each, which is about half the brightness of those bulbs. Seven watts is a bit of power, but when you multiply it by six bubbles, you get 42 watts for about 12 hours a day. 42 times for 12 hours on 30 days a month are 15 kilowatt hours. My electricity costs 11 cents per kilowatt hour, so it cost me about $1.65 a month for electricity to keep the porch light on all night. Each of these bulbs only uses 1.5 watts to double the brightness, so I could use fewer bulbs if I wanted to. too (but I'm not). 1.5 watts per bulb, 6 bulbs correspond to a total of 9 watts. 9x12x30 = 3.2 kilowatt hours. 3.2 times 11 cents per kWh is 35 cents per month. These bulbs save me $1.30 a month in electricity. $1.30 a month is a small saving, but that's $15.60 a year. On top of that, I was spending another $15 a year to replace the lightbulb every few weeks. I've had these bulbs for 6 months now and none of them have burned out. You have already paid for yourself.
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