Part of the reason the figure is so high is that traditional incandescent bulbs (Edison's filament bulb) eat up a lot of power to produce light: 90 percent of the energy is wasted as heat.
So far the main alternatives to the common bulb have been compact fluorescent lights, or CFLs, and light-emitting diodes, or LEDs, which can produce the same amount of light as traditional bulbs while using way less energy.
Soon, a fourth lighting option will be thrown into the mix. It's called the FIPEL, which is short for field-induced polymer electroluminescent technology.