For measurement of high-powered LEDs and sources, Avantes offers a large integrating sphere, called AvaSphere-100. The number 100 corresponds to the internal diameter of the sphere in millimeters.
The model comes with three ports: at 0, 90 degrees, and NP. One port is fitted with a baffled SMA-905 connector. One port is equipped with a port plug, and the 3rd is used for illumination or sampling.
The sphere comes with a post mount and can be attached to spectrometers via fiber-optic cables. The entire system can be irradiance calibrated.