High contrast, low glare OttLite illumination is specially designed to help you see clearly and comfortably. Three color modes (warm light, cool light and OttLite natural daylight) and five 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'. Base size is 4' x 4.1'. Super bright natural daylight LEDs rated to last up to 40,000 hours.