A federal energy bill approved in December will require a 70 percent increase in lighting efficiency by 2020, spelling trouble for the inefficient incandescent lightbulb.The year 2020 is several lightbulb changes away, but Roger Deane is not waiting to tap into the latest in green technology for lighting his Scottsdale home. An admitted electronics enthusiast, Deane has converted all his interior and exterior lighting to light-emitting diodes, or LED lighting.