I've used strings of 10 LED modules with 4 LEDs each (about 1.1W per module or so) for ceiling lights in my office. Mounted them on a painted 1/8" piece of plywood with a piece of acrylic (coated with Krylon frosted glass spray) on 1" distancers, and screwed directly to the ceiling. Looks great, is easy to install, and at about 20W gives me the same light as about 50W of CFLs.
I plan on transitioning most of the lighting in our house to LEDs. The modules I used are available for about 22 bucks for a string of 20 of them!
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