Integrating spheres, sometimes named Ulbricht spheres, are capable to measure integrated photometric quantities like total luminous or radiant flux. Similarly, average colorimetric quantities of a lighting device may be measured, either within a solid angle of 4π or 2π. Typical applications are
- Luminous flux measurements of light sources in production, quality control, research and development
- Chromaticity measurements with colorimeters and spectroradiometers
- Luminous flux calibration of working standards
- Time-resolved light source measurement, for instance Optical Flicker
Integrating spheres with diameters of 1 m and 1.65 m and an Integrator with 2.25 m x 1.65 m for measurement of luminous flux, average chromaticity coordinates or integral radiometric properties.