light emitted in all directions, measured in lm. It’s Illuminance (E) is the the value of radiant flux which contains those term given to the wavelenghts which are detectable by the human quanitify of luminous flux eye. falling on unit area of a Luminous intensity (I) is a measure of the surface. luminous flux over a solid angle (steradian (ω)) E = Ф/A emitted to a given direction (cd). Unit - lux (lx) Illuminance (E) is the term given to the The value of illuminance quanitify of luminous flux falling on unit area of a depends on the distance surface, measured in lx. of lighting source. • E = I cos α / r2, where Luminance (L) is the luminous intensity emitted
atoms in 0,012 kg of carbon-12. When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles. Kandela - the candela is the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and has a radiant intensity in that direction of 1/683 watts per steradian SI tuletatud ühikud - tuletatud SI ühikud on saadud SI põhiühikutest ühendades suuruste füüsikalisi omadusi. Kordühik - mõõtühik, mis saadakse antud mõõtühiku korrutamisel ühest suurema täisarvuga (N: kilomeeter on meetri detsimaalne kordühik, tund on sekundi mittedetsimaalne kordühik). Osaühik - mõõtühik, mis saadakse antud mõõtühiku jagamisel ühest suurema täisarvuga. Suuruse väärtus - Arv ja mõõtühik, mis koos väljendavad suurust kvantitatiivselt
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