Compact fluorescent lightbulb
Compact Fluorescent Lightbulbs are new, energy efficient lightbulbs. They use only 15w but provide light equivalent to 60w.
CFL's save energy, reduce carbon dioxide emissions, and save money on electricity bills. They also produce less heat, so your reading lamp will not be hot to the touch.
However, these bulbs do contain mercury, so broken bulbs should be handled with care, and steps should be taken to ensure safety.