“How Many Lightbulbs Does it Take to Change the World?”

(Fast Company, September 2006)

Last year, conversations started in Wal-Mart around the potential of swirls to save customers money on utility bills. “Somebody asked, ‘What difference would it make if we changed the bulbs in the ceiling-fan display to CFLs?’” says Kerby. A typical Wal-Mart has 10 models of ceiling fans on display, each with four bulbs. Forty bulbs per store, 3,230 stores.

“Someone went off and did the math,” says Kerby. “They told me we could save $6 million in electric bills by changing the incandescents to CFLs in more than 3,000 Wal-Marts….I said, that can’t be right, go back and do the math again.” The numbers came out the same the second time: savings of $6 million a year. “That, for me, was an ‘I got it’ moment.”