Ten LED?s mixed and matched to generate the correct color rendering. LEDs used for Dental Light 900 use a high rendering LED. It contains blue, red and green lights and shows all colors correctly. The "color rendering property" is over 90. Color rendering property is the sum of how MANY DIFFERENT COLORS are shown correctly under the light. Brightness is a smooth transition between 4,000 lux and 32,000 lux. There is also a composite mode of 5,500 lux. The good part of this LED is that the color is constantly maintained at 5000K using natural color at any intensity level. In composite mode, it is a natural white color. The intensity is adjustable by a rotation knob steplessly.