Suga UV Long-Life Auto Fade Meter is extensively used for color fastness test of textile materials. An enclosed carbon arc lamp as the light source has the longest history of use among weathering the apparatus. It has intense energy in the UV range (around 388nm) and can be lighted continuously for 48 hours. U48AU has an automatic air control system with an air control valve to mix circulating chamber-air and introduced ambient-air. It also includes a vaporizer, which allows for a highly precise control of temperature and humidity.