"A household that invested $90 in changing 30 fixtures to CFLs [from incandescent bulbs] would save $440 to $1,500 over the five-year life of the bulbs, dependi

"A household that invested $90 in changing 30 fixtures to CFLs [from incandescent bulbs] would save $440 to $1,500 over the five-year life of the bulbs, depending on your cost of electricity. Look at your utility bill and imagine a 12% discount to estimate the savings." http://www.usnews.com/money/business-economy/articles/2007/12/19/faq-the-end-of-the-light-bulb-as-we-know-it.html http://www.usnews.com/money/business-economy/articles/2007/1...