Relasyon konvèsyon ant klète mèt illuminance a ak inite illuminance a
(1) Lè yon sous limyè klere sou yon objè, nou ka mezire ki emèt sous la (Lumvnance? D klète) oswa ki reflete pa objè a (Illuminance? D illuminance).
(2) Ekleraj depann de pwopriyete meditativ yon objè. Li sanble anpil ak yon foto paske li mezire sèlman limyè reflete. Inite komen li se lux.
(3) Sepandan, yon lanp EL se yon sous limyè: li ta dwe eksprime nan inite luminans, sa vle di, fL (pye Lambert) oswa cd/m2, ke yo rele tou "nits". Gen kèk enjenyè pito fL, pandan ke Òganizasyon Estanda Entènasyonal la itilize nits. nits konvèti an fL pa fòmil la: 1nits x 0.2919=1fL; ak 1fL x 3.426=1nits [Remak; faktè sa yo sòti nan pi(π) ak m2/ft2 (0.0929).
(4) Li klè ke itilizasyon lux se yon inite kòrèk, ni li pa ka konvèti soti nan lux nan lòt inite. 1 Lux=1 lumenpersquaremeter= 0.0929 footcandle 1 footcandle= 1lumen persquarefoot =10.764 Lux1 pye Lambert= 3.426 kandela pa mèt kare (nit) 1nit ( kandela pa mèt kare)=0.2919 pye Lambert
Flux lumineux
Flux lumineux (Luminousflux): se sa ki, pousantaj enèji limyè ki gaye pa yon sous limyè oswa pousantaj koule nan limyè (Flowarte), pou deskripsyon kapasite sous limyè a emèt limyè kantite debaz limyè, la. inite pou lumèn nan (Lumen). Pa egzanp, yon anpoul limyè 100-watt (W) ka pwodui 1,750lm, pandan y ap yon tib fliyoresan blan 40W fre ka pwodui 3,150lm flux lumineux. Dapre definisyon, 1lm se flux lumineux emèt pa yon sous limyè pwen inifòm nan entansite lumineux (l) 1cd nan yon ang stereo nan 1 degre esferik.
Entansite lumineux
Luminous intensity (Luminousintensity, Candlepower): Luminous intensity referred to as luminous intensity, refers to a stereo angle from the light source (unit sr) radiated by the luminous flux, that is, the light source or lighting fixtures emitted by the luminous flux in the space of the selected direction on the distribution of density in the unit of candela (CandleorCandela, cd). Luminous intensity of 1cd light source can radiate 12.57lm of luminous flux. Illumination illuminance (luminance): illuminated plane to receive the density of luminous flux, available per unit area of luminous flux to measure. 1lm of luminous flux uniformly distributed in 1 square meter (m2) of the surface, that is, to produce 1 lux (Lux, environmental technology>illuminance meter) nan illuminance a; 1lm nan flux lumineux tonbe sou sifas 1 pye kare (ft2), valè illuminance 1 pye-bouji ( Footcandle, fc).
