
OK, I'm not a big fan of Starbucks but every bit helps.
On a light-by-light basis, changing from incandescent to LED only makes a tiny difference in energy consumption and cost, but when you're talking about retrofitting a large building like the Empire State Building or replacing bulbs in thousands of Starbucks stores, the energy savings can be huge.
http://www.getwithgreen.com/2010/12/13/starbucks-saves-millions-on-energy-bills-with-led-lighting/
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Looking forward to your comments, Barry.