I chose to use the Philips Ambient LED bulb also known as the Philips EnduraLED bulb; 12.5watts, 800 lumens, 2700K (warm), dimmable. This bulb is very similar to the L-Prize lamp (http://www.lightingprize.org/60watt.stm
) that won the US Department of Energy prize for an LED bulb that closely matched a standard 60W incandescent but uses <10W. The Philips AmbientLED was available for sale before the L-Prize lamp and has specs that are not quite as tight as the L-Prize lamp, but cheaper, and good enough. In my area the AmbientLED bulb is available at Home Depot for $15 (heavily subsidized by local utilities). I purchased my first one back when they were originally introduced at $40.
Both the AmbientLED and L-Prize lamps are the funny looking bulbs that look orange when not energized. The plastic lenses have phosphor in them that gives the lens the orange color. The bulb uses BLUE LEDs behind the lens so that when the blue light strikes the phosphor in the plastic the phosphor glows white. This apparently has some efficiency advantages and helps with consistent light color. 'Regular' white LEDs are also blue LEDs but have the phosphor applied directly to the LED die (silicon) but Philips separates them for this bulb. I popped open one of the orange plastic lenses and you can see the blue LEDs inside.
These LED bulbs are very bright and virtually match the color of a 60W incandescent. They are also estimated to last 25,000 hours, or 22.8 years
at 3 hours per day, per the box. See my side by side comparison of a 60W incandescent to the 12.5W LED in my torchieres. However, 60W is not enough so on with the build....