What is the best low-consumption high-powered light bulb?

LED light bulbs would be the best choice in the long run since they usually last over 50,000 hours and use at least 75% less energy than incandescent bulbs. But they are expensive $7.00 each for a generic brand. Compact flourescent light bulbs last between 6,000 and 15,000 hours and use 75% less energy than incandescent bulbs. These are a little less expensive $5.00 for a GE brand bulb.