L80B20 daim ntawv pov thawj ntawm LED txoj kev teeb yog dab tsi, coj sab nraum zoov kev ua si teeb?
L txhais cov lumen feem pua piv rau qhov pib lumen, Qhov sib piv ntawm cov luminous flux ntawm lub teeb thiab thawj luminous flux ntawm lub teeb yog siv rau ib lub sij hawm ntawm lub sij hawm, L70 qhia tias lub luminous flux attenuates mus rau 70 feem pua ntawm cov thawj luminous. flux, L80 mus rau 80 feem pua, L90 rau 90 feem pua ntawm cov thawj flux.
B qhov tseem ceeb sawv cev cov ntaub ntawv tsis raug ntawm L cov ntaub ntawv,
B10 hais tias 10 feem pua ntawm LED tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua,
Piv txwv li, 50000 h (L90 / B10), uas yog, 10 feem pua ntawm cov khoom luminous flux tso zis rau tus nqi pib tsawg dua 90 feem pua ntawm lub sij hawm siv yog 50000 teev.
Hloov pauv, cov khoom lag luam LED muaj kev ntseeg siab tsawg dua 10 feem pua lub teeb lwj tom qab 50, 000 teev ua haujlwm
