A prize-winning light bulb, known as led bulb that lasts for 20 years is going on sale in the US starting on Earth Day.
energy efficient
Law To Standardize Energy Efficiency For Light Bulbs, Some Lawmakers Want It Repealed
With a January deadline looming on a US law mandating energy efficiency standards for light bulbs, more than a dozen Republican lawmakers are backing efforts to repeal the 2007 law.