Description?: integrating spheres, spheres, diffuse reflectance, luminance, luminous intensity, metrology, optical calibration, reflectance standards, radiance standards, flux standards, spectral flux, led power measurement, laser diode measurement, illuminance, radiance, irradiance, calibration, optowhite, Zenith® , uniform source, goniometer, colorimeter, white coating, PTFE, BaS04, analytical laboratory,...