How nutritious is your light bulb? (in lumens, of course)

No joke -- starting mid-2011, US light bulbs will have nutrition facts of their own. Backed by Congress, the FTC has mandated that light bulbs carry the label at top, allowing buyers to clearly compare brightness, life expectancy and energy cost. Of course, many manufacturers call out these facts already, but hopefully this will keep the rest from confusing potency with power -- by advertising that a mid-range LED unit that slowly sips energy, for instance, is "equivalent to 40 watts."