How many congressmen does it take to change a light bulb? 400. That's how many members of Congress recently voted for a bill to force Americans to change the 50-cent incandescent light bulbs they're currently using and replace them with expensive new, $3 "energy-efficient" light bulbs. As Shane Cory of the Libertarian Party sarcastically put it, "If you outlaw light bulbs, then only outlaws will have light bulbs." The ban, which takes effect in 2014, was included in the 2007 energy bill, which 314 members of the United States House of Representatives and 86 members of the United States Senate …