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Showing posts from January, 2013

On CFLs and Lumens

In my building I have a eight light fixtures that need to be lit 24 hours a day, 365 days a year. Some of these fixtures have a single socket, others have a dual socket.

Original Plan: Twelve 60 watt bulbs, $756 in electricity per year

Originally, we were running 60 watt incandescent bulbs.  They provided more than enough light, but cost us a ton of money in electricity.  Further, they had a lousy life, needing replacement several times per year - a lot of labor when you are paying a maintenance company.

More Efficient Plan: Twelve 13 watt CFL bulbs, $163 in electricity per year

About 5 years ago, we switched to 13 watt CFLs.  These bulbs, on average, lasted nearly 3 years and saved us about 70%.    We still had way more than enough light.

Current Plan: Eight 7 watt CFL bulbs, $60 in electricity per year

Two years ago we stepped up our game.   We realized that we would get adequate light from 7 watt CFLs, and that multi-bulb fixtures only required a single bulb.  That means four sockets …