This link is from my bro, he and I have done the switch and saved a bunch of $$ the last few years, read the article and you will too:
http://www.fastcompany.com/subscr/108/open_lightbulbs.html
What's astounding is that they don't even mention the connection that if you have a bulb running 70% cooler, then your cooling costs for buildings will also decrease, further leading to a decrease in electricity usage and possibly longer life for existing HVAC infrastructure.
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