High contrast, low glare OttLite illumination is specially designed to help you see clearly and comfortably 3 color modes (warm light, cool light and OttLite natural daylight) and 5 brightness settings to brighten your work area Touch sensitive control panel Illumination and air circulation right at your fingertips with a fan integrated right into the base Height adjusts from 15 to 26.5 inches, Base size: 4 x 4.1 inches Super bright natural daylight LEDs rated to last up to 40,000 hours