I don’t usually link to commercial sites unless the product is wack(y) however the info here is interesting. LED lightbulbs are very expensive ($30-45 each) but last 60,000 hours vs. a conventional incandescent which almost exactly offsets the cost difference (60 regular bulbs = 1 LED). Better yet, the light is much more natural, they are instant on and they are very energy efficient. Unlike flourescent and incandescent, they are directional which means you can get flood-style bulbs.
Scoll down the table on the site for more fun facts!
Opps, as Kottke points out, they give out a lot less light…