Two lamps in one - use with base or space-saving clamp-on conversion kit * Includes energy efficient 18wHD tube -rated to last up to 10,000 hours * Max. Height: 38.00-Inch Min. Height: 10.25-Inch Base Diameter: 9.00-Inch * Low heat, low glare illumination helps reduce eyestrain * Adjustable shade directs light where yo need it.