Analysis of the Measuring Position for luminous flux

There are two ways to test luminous flux, integrating Sphere System and variable angle photometer. variable angle photometer this may be the most precise way to test luminous flux.and is a test processing that needs much time. So today, luminous flux of test are generally used on the integrating Sphere System. there are basically two types test structure for luminous flux test。

One way to do this is to use the center of test container for led test. —–led are located in the center of test container.

Another approach is to store the led in the brim of test container.