In September, the European Union banned the sale of 100-watt incandescent light bulbs, with lawbreakers facing up to $70,000 in fines. Over the next few years, bans on lower-wattage bulbs kick in. In the United States, similar legislation comes into play in 2012. The idea is to kickstart the market for compact fluorescent lights (CFLs), which use less energy than conventional incandescents. Although CF...