The Defy uses RGBW LEDs, where each small package contains 4 separate LED diodes: one for red, blue, green and white. Each key has an LED and there are 70 keys in the whole keyboard, 35 per half.
The underglow has 106 LEDs, 53 per half. This makes 176 RGBWs for 704 LED diodes in total.
The Dygma Defy keyboard is the only keyboard in the world with the W feature in its LEDs (RGBW). Developing this LED structure with the quality features required for this product was a nightmare for the engineering department. Want to know why?