Proprietary exclusive OttLite ClearSun LED reduces eyestrain by 51%. Provides smooth, uniform light with Color Rendering Index (CRI) of 95+ for excellent color accuracy. Specially designed to help you see clearly and comfortably. Rounded diffuser mimics the look of traditional bulbs. Maximum lumen output of 400 with touch activated control. Three brightness settings. Three adjustable knobs for precise positioning of light. Integrated 5V, 2.1A USB port - fully charges tablets, phones, and other devices.