Small board (5x10 cm = ~2x4 inches) with 32 RGBWW LEDs and two 16-channel constant current LED drivers. LEDs can be controlled over serial interface in groups of four with 12-bit PWM. Final lighting fixture will contain 30 of these boards for a total of 960 LED packages. Boards can be chained together.
Driver datasheet: http://www.siti.com.tw/product/spec/LED/DM633.pdf