http://www.studylite.in/intro.html

http://www.studylite.in/intro.html

LEDs are either of a specific color (royal blue, blue, green, cyan, amber, orange-red, red) or are “white”, which is obtained by mixing a blue LED with phosphors that lengthen the frequencies provided. “White” LEDs are commonly available in “cool white” (which has looks like a welding arc), “neutral white” (to my eye, very nice, though it can be greenish), and “warm white”, which looks similar to a “warm white” fluorescent tube. In each case, the light is better-looking that what you get from a fluorescent tube, and the new white LEDs are as efficient (or better) than good fluorescents, but provide better directional control of their light. To get “rose” light, you would probably mix red and orange-red with some flavor of white. I read, somewhere, that mixing several cool whites with a red gives a nice-looking light, but I have not tried that myself. A typical modern power LED (Luxeon III, Luxeon Rebel, or CREE XRE) draws between 350mA and 1000 mA at 3.3 volts, and costs about $8 mounted on a puck. Cooling is an issue; too much heat shortens their life, and they are more efficient at cooler temperatures anyway.

If you were doing do-it-yourself, you could assemble a really ugly lamp that produced in the neighborhood of 700-900 lumens of light, drawing 11 watts, for about $120 (I have exactly that under my kitchen cabinets, so the ugly is hidden from view, but the light is not. Having all the LEDs spread out across the bottom of the cabinets is also beneficial to the cooling). LEDs are still blessedly expensive; I currently use them in places where the efficiency and/or durability matters (bicycle), or where they are on often, and their low profile is beneficial (under cabinet).

What about that new desklamp from Finelite? You should review it!
It is awesome!

You can buy it from their website here:
http://finelite.pinnaclecart.com/products/PLS_6_Watt_Desk_Lamp-36-1.html

Jeff