ulbricht sphere

ulbricht sphere luminous flux measurement optical systems spectral power distribution photometric analysis light source sensor bulb electric shiny studio steel equipment isolated gold ptfe cie84 chromaticity lamp lengths wavelengths ray density radiant irradiance emitters infrared technicians lightning technology engineering physics laboratory synthetic odm98 coating barium sulfate photoluminescence absorption transmission reflection diffuse radiation fields detectors divergent back view esfera para mediciã³n del flujo luminoso vista trasera medicion medición metallic color