There is an argument between Energy Secretary Steven Chu and GOP on the Energy Department investment of $10 million “L Prize” to Philips for an LED light bulb that retails for $50. The GOP has criticized the Energy Department for backing such an expensive light bulb, arguing it’s too pricey for the average consumer. But at a Senate Energy and Natural Resources Committee, Chu defended that the department backed the product as a first step in developing cheaper energy-efficient light bulbs over time. “The idea of that light bulb co...