I have a home made LED lamp now as my main source of light in the living room. I designed it to fit a normal light bulb socket. It is running off my solar battery pack through an inverter.

The great thing about this LED bulb is that there are no resistors used at all. That means no waste energy. I used 60 LEDs, a bridge rectifier and a capacitor. All energy is used for light output. Most LED bulbs you can buy in stores use a resistor for every LED to reduce the amount of current. I just divided the amount of current with LEDs themselves.

You can see details on how to make one at:

http://www.metwebsites.com/wwr&d/LEDs.html

The total power consumption for this lamp is about 4 watts.