photomètre

Then we measure the light density by means of the so-called photometre in a determined direction, for example, vertically to this surface.
Ensuite, nous mesurons à l'aide d'une prétendue photomètre la luminance lumineuse dans une direction tout à fait précise, par exemple verticalement à cette surface.
Then, we exchange our small piece of screen with another piece of screen, whereby this surface is supposed to reflect absolutely in all directions and with our photometre, we measure again the light density LW.
Nous échangeons notre petit morceau d'écran contre un autre morceau de surface d'affichage, de sorte que cette surface doit être parfaitement réfléchissante dans toutes les directions et nous mesurons de nouveau avec notre photomètre la luminance lumineuse LW.
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