In the Wall Street Journal , November 30, 2011, an article details how LEDs have become the best buys in areas of commercial lighting. And they are increasingly able to compete in other types of lighting as their costs plunge.
Blessed with low power usage and high light output, the key factor that has held recent-vintage, high-quality LED adoption back has been their high purchase price. But due to their exceptionally long life span, LEDs are beginning to take off in commercial applications where the economy of infrequent replacement trumps bulb cost. Bulb costs are predicted to continue dropping 30% per year until 2015.