There are many LED manufactories using two integrating spheres and onespectrophotometer to do test. The previous testing way is: when you use big sphere to test, the customer need to connect the detector cable and optical fiber from the Spectrophotometer to the big sphere, after the calibrating and then you can do the test. When you use the small sphere, you need to take away the detector cable and optical fiber from the big sphere to the small sphere, then need to calibrate again…