Luminance
Illuminance, feem ntau hu ua lux (lux), sawv cev rau lub luminous flux ib chav tsev ntawm qhov kev kawm nto. 1 lux yog sib npaug rau 1 lumen / square meter, uas yog, luminous flux irradiated vertically los ntawm lub teeb qhov chaw nrog ib tug deb ntawm ib 'meter' thiab ib tug luminous siv ntawm 1 tswm ciab ib square meter ntawm cov kev kawm. Illuminance yog qhov taw qhia tseem ceeb los ntsuas qhov chaw tua.
Txoj kev siv teeb pom kev hauv tsev siv coefficient suav qhov nruab nrab illuminance:
Thaum peb feem ntau ua illuminance xam, yog tias peb paub qhov kev siv coefficient "CU", peb tuaj yeem yooj yim siv cov qauv empirical los xam sai kom pom qhov nruab nrab illuminance tus nqi ntawm qhov chaw ua haujlwm sab hauv tsev peb xav tau. Peb feem ntau xa mus rau txoj kev xam no li "siv txoj kev coefficient los nrhiav qhov nruab nrab illuminance", los yog hu ua lumen coefficient txoj kev.
Muaj ob hom kev ntsuas hluav taws xob: kev suav ntxhib thiab suav tseeb.
Piv txwv
Piv txwv li, piv txwv li, tag nrho cov teeb pom kev zoo yuav tsum yog 100 lux (lx) zoo li lub tsev, thiab txawm tias 90 lux (lx) yuav tsis muaj kev cuam tshuam loj rau lub neej. Txawm li cas los xij, yog tias nws yog txoj kev teeb pom kev zoo, qhov xwm txheej txawv. Piv txwv tias txoj kev teeb pom kev zoo yuav tsum yog 20 lux (lx), yog tias nws yog 18 lux (lx), nws yuav ua rau muaj kev sib tsoo ntau zaus.
Ib yam yog muaj tseeb rau lub khw, piv txwv li, tag nrho qhov zoo tshaj plaws illuminance rau lub khw yog 500 lux (lx), txij li thaum illuminance ntawm 600 lux (lx) yog siv. Yog li ntawd, tus naj npawb ntawm cov teeb pom kev zoo thiab cov nqi hluav taws xob yuav nce ntxiv, thiab nws yuav muaj kev cuam tshuam nyiaj txiag
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