When energy-saving lighting first hit the market, many of them were less than luminary in terms of style and cost-not to mention that ghastly glow. But awareness around efficiency has spread, even at the mass level: In 2012, the Montreal hockey arena, Bell Centre, replaced its old bulbs with 140 LEDs. The same year, New York City’s Central Park completed a massive installation of 1,600 LEDs. Companies have developed better energy-efficient alternatives for the home, too. The British company Plumen, for example, offers high-design, low-energy light bulbs, pendants, chandeliers, and shades at affordable prices. (They ship to the U.S. with…