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, establishes higher standards of performance for reproducibility, repeatability and operating efficiency in durability testing of coatings, plastics, paints, coatings and numerous other materials that must withstand exposure to moisture, temperature and humidity. Visit