"Philips' LED bulb slashes electric bills by 50%"

Philips has launched its Ultra Efficient LED bulbs, which use just 4.5 watts of energy, about half as much as some of the more popular LED bulbs available today. The bulbs are estimated to cost as little as 55 cents per year and last up to 45.7 years. The bulbs are being sold exclusively at Walmart and come in three sizes and two color temperatures. However, the bulbs are not dimmable and are more expensive upfront than similar bulbs.