I made a circular light installation using 24 3w leds, using custom dimmers based on the TLC5940 chip dimsun | Conversations with spaces
There is some documentation of the original version here:
blink blink | Conversations with spaces
It is currently being shown in Berlin as part of the Club Transmediale exhibition which runs until February 28th:
http://www.clubtransmediale.de/ctm-festival/day-program/exhibition/esemplasticism-the-truth-is-a-compromise/photo/1.html
hc