Proprietary, exclusive OttLite ClearSun® LED, reduces eyestrain by 51%. Provides smooth, uniform light with Color Rendering Index (CRI) of 97. Adjust brightness level with touch dimming. Maximum lumen output of 400. Dimmable with touch controls and long 9' shade for expansive illumination. Includes 5V, 2.1A USB port to fully charge smart phones and tablets. Qi charging for wireless charging Qi-enabled devices including the iPhone 8 and above. Flexible neck adjusts lamp height from 13' to 21'. Base measures 7.5' x 5.12'. Energy efficient LEDs rated to last up to 40,000 hours.