The old standard incandescent light bulbs are set to be banned and discontinued in 2012. Nonetheless, people are clinging to their tried and true light bulbs. Lighting manufacturers, recognizing the installed base that more efficient incandescent bulbs would have are working hard to develop incandescent light bulbs that consume much less energy than before.
So far a decent development has been from Philips Lighting's Halogena Energy Savers; a 70 watt incandescent that puts out the light of a 100 watt. That's a 30% increase in efficiency, which is pretty good for a first try. The company Deposition Sciences is responsible for this bulb's creation, and is trying to market it to light bulb manufacturers.
There is always development going on in the lighting industry, but the main impetus for more efficient incandescent light bulbs came from Congress' 2007 federal energy bill, set to begin 2012. Standard household incandescent light bulbs will be banned from resellers, who will have to replace them with more energy efficient options.
The current most common energy efficient light bulbs are compact fluorescent light bulbs. This could very well change if light bulb research continues to uncover more efficient technologies. Deposition Science has reported 50% increased efficiency in the lab, while another inventor in Los Angeles expects 100% efficiency increase.
The new incandescent light bulbs come at prices much closer to compact fluorescents, so we will see how purchasing patterns end up.