Proprietary exclusive OttLite ClearSun LED reduces eyestrain by 51%. Provides smooth, uniform light with Color Rendering Index (CRI) of 95+ for excellent color accuracy. 3 brightness levels with touch-sensitive dimming. Maximum lumen output of 400,9 inch long shade provides expansive illumination. Touch-sensitive controls. Integrated 5V, 2.1A USB port fully charges smartphones, tablets, and other devices.