The Controlled Irradiance (Ci) Xenon Arc Systems deliver constant levels of irradiance, and precise temperature and humidity control. The series, including the Atlas Ci3000+, Ci4000 and Ci5000 Weather-Ometers®, uses advanced, water-cooled xenon arc lamps to deliver constant amounts of radiant exposure. Easily interchangeable glass filters tailor the xenon light spectrum to match sunlight conditions in a sample's end-use environment. Call 773/327.4520 or visit www.atlas-mts.com.