Philips wins $10M L Prize for LED-based 60W replacement bulb article tells that Philips wins $10M L Prize for LED-based 60W replacement bulb. The bulbs had to meet or exceed a set of requirements: greater than 900lm at 10W or less (efficacy of greater than 90W/lm) at a color-corrected temperature (CCT) of 2700-3000K and a color rendering index (CRI) of at least 90.
The winning Philips bulb uses a clever remote phosphor system to gain a spherical distribution of light. For more details on that read the Philips LED bulb tear-down article.
L Prize competition is planned to accelerate America’s shift from inefficient, dated lighting products to innovative, high-performance products. DOE’s first L Prize category launched in 2008 targets the 60-watt bulb because it is one of the most widely used types of light bulbs by consumers, representing roughly half of the domestic incandescent light bulb market (more than 425 million bulbs sold in USA every year).