Kev sib txuas ntawm cov xim
Txhawm rau txo qhov kev hloov pauv ntawm cov xim thiab cov zis uas tuaj yeem pom los ntawm kev sib tw rau kev sib tw, COB LEDs yog binned raws li xim xim (chromaticity), lumen tso zis, thiab rau pem hauv ntej voltage. Vim muaj qhov tshwm sim ntawm ib leeg-LED modules hauv COB teeb pom kev zoo, flux binning ntawm COB LEDs yog qhov tseem ceeb dua thaum piv rau kev sib cais nruab nrab ntawm lub zog LEDs. Ua kom chromaticity coordinates nyob rau hauv nruj tswj yog ib qho tseem ceeb nam ntawm architectural teeb pom kev zoo raws li ib txwm. Lub koom haum American National Standards Institute (ANSI) parallelograms lossis Standard Deviation Color Matching (SDCM) MacAdam ellipses yog siv los categorize COB LEDs txhawm rau tiv thaiv qhov sib txawv ntawm chromaticity hloov pauv hauv cov txheej txheem tsim khoom.
Ib cheeb tsam elliptical tsim nyob ib ncig ntawm chromaticity kev tswj hwm hauv CIE 1931 (x, y) xim qhov chaw hu ua MacAdam ellipse. Tsawg xim hloov pauv tau nrog ellipse loj. Qhov kev nkag siab ntawm qhov sib txawv ntawm LEDs yog ntsuas siv ANSI xim binning tswvyim siv parallelograms. Cov xim bins nyob rau hauv C78.377-2008 tus qauv yog txhais los ntawm ANSI siv parallelograms uas yog nruab nrab ntawm lub cev dub kab thiab muaj ib tug 7- kauj ruam MacAdam ellipse. Ntau tus kws paub txog teeb pom kev zoo tseem siv "MacAdam ellipses" los piav qhia txog qib ntawm cov xim sib xws. Nrog ob lossis peb kauj ruam ntawm MacAdam ellipse xim kam rau ua, COB LEDs nquag siv hauv high-end architectural teeb pom kev zoo. Chromaticity variations ntawm 3- kauj ruam MacAdam ellipse yog xav tias yuav tsis tshua pom. Hauv daim ntawv thov teeb pom kev zoo tib yam, ib qho 5- kauj ruam ellipse tseem txaus, thaum cov ntawv thov nkag tuaj yeem khiav mus nrog 7- kauj ruam ellipse.
