LED teeb lwj yog hais txog kev txo qis hauv luminous flux (brightness) ntawm LED lub sijhawm, uas yog qhov tseem ceeb tshaj plaws los txiav txim siab nws txoj kev ua neej. Tsis zoo li cov qij ib txwm ua tsis tau tam sim ntawd, LEDs feem ntau "tuag" los ntawm kev dimming kom txog thaum lawv lub teeb tso zis yuav siv tsis tau. Hauv qab no yog cov ncauj lus kom ntxaws tsom xam ntawm nws cov mechanisms, muaj feem cuam tshuam, thiab ntsuas:
1. Ua rau LED Teeb Decay
Chip degradation: LED nti cov khoom siv semiconductor (xws li, GaN) deteriorate nyob rau hauv qhov kub thiab txias, txo electroluminescence efficiency. Xiav- lub teeb ci hauv cov LEDs dawb degrade sai dua lwm cov xim .
Phosphor Aging: Dawb LEDs siv xiav chips + daj phosphors. Phosphors degrade nyob rau hauv tshav kub / UV raug, txo kev hloov dua siab tshiab thiab ua rau cov xim hloov (xws li, yellowing los yog xiav-liab tints).
Encapsulation Material Failure:
Epoxy resin yellows nyob rau hauv UV hluav taws xob, thaiv lub teeb tso zis.
Silicone encapsulation tiv thaiv UV tab sis tuaj yeem tsim cov micropores, tso cai rau lub teeb xiav kom xau thiab nce xim kub.
Sulfide ib puag ncig (xws li, thaj chaw muaj kev lag luam) hnov mob nrog nyiaj hauv LED, tsim Ag₂S dub thiab thaiv lub teeb.
Teeb meem tsav tsheb Circuit Court: Overcurrent lossis voltage spikes nrawm nti overheating, pab ua kom tawg sai.
2. Yam tseem ceeb cuam tshuam lub teeb lwj
Junction Temperature (Tj):
Qhov tseem ceeb! Txhua txhua 10-15℃nce hauv Tj ob npaug ntawm tus nqi lwj.
Piv txwv:
Ntawm Tj=105 degree, qhov ci poob mus rau 70% (L70) hauv ~ 10,000 teev.
Ntawm Tj=65 degree, L70 txuas mus rau ~ 90,000 teev.
Tsav tam sim no:
Higher currents (e.g., >20mA for low-power LEDs) increase heat generation. Reducing current from 20mA to 14mA can lower decay by >15% .
Thermal Management:
Poor heat dissipation (e.g., enclosed fixtures) traps heat, raising Tj. Spacing LEDs >25mm txo thermal crosstalk.
Khoom zoo:
Low-quality encapsulation (e.g., Class D epoxy) causes >70% decay in 1,000 hours, while Class A silicone maintains >94% brightness.
3. Ntsuas thiab txhais lub neej ntev
L70 Txheem: Kev lag luam txhais "qhov kawg ntawm lub neej" raws li 30% brightness poob. Piv txwv li:
Zog Hnub Qubxav tau L70 Ntau dua lossis sib npaug rau 35,000 teev (Ntau dua lossis sib npaug rau 94.1% ci ntsa iab ntawm 6,000 teev).
Txoj Kev Xeem:
Accelerated Aging: High- ntsuas kub (piv txwv li, 85℃/ 85% RH) simulate xyoo ntawm kev lwj hauv lub lis piam.
Junction Temperature kwv yees: Ntsuas voltage poob (ΔV) thaum ua haujlwm. ΔV=4mV /℃rau Cree LEDs; eg, ΔV=0.3V implies Tj≈95℃.
4. Real-Lub Ntiaj Teb vs. Theoretical Lifespan
Lab Claims: Cov neeg tsim khoom hais txog 50,000-100,000 teev, tab sis qhov no tsis quav ntsej txog kev ntxhov siab ib puag ncig.
Kev ua tau zoo:
LEDs sab hauv tsev: Cov khoom zoo ua tiav L70 hauv 25,000-50,000 teev.
Sab nraum zoov LEDs: Plua plav, UV, thiab thermal cycling shorten lifespan rau 15,000-30,000 teev.
Tsawg-Tus nqi LEDs: Tej zaum yuav lwj 30-50% hauv 1,000 teev vim cov khoom tsis zoo.
5. Cov tswv yim txo qis
Thermal Design: Siv aluminium substrates, cov dab dej kub, thiab tsis txhob muaj cov khoom siv hauv tsev.
Kev xaiv khoom: Xaiv rau silicone encapsulation thiab sulfur-resistant.
Tsav Optimization: Tsis tu ncua- tsav tsheb tam sim no (piv txwv li, 15–18mA) tiv thaiv overcurrent .
Environment Control: Qhov cua los yog cua txias hauv siab - ntom ntom .
LED lub teeb lwj yog qhov tsis tuaj yeem tab sis tswj tau.Kev sib tshuam kubyog qhov tseem ceeb tswj tau qhov tseem ceeb - tswj Tj Tsawg dua lossis sib npaug li 75℃txuas rau lub neej siv tau tshaj 50,000 teev. Ua ntej LEDs nrogL70 cov ntaub ntawv los ntawm cov ntawv pov thawjthiab zam ultra- cov kev xaiv pheej yig tsis muaj kev tswj xyuas thermal. Rau qhov chaw hnyav (piv txwv li, cov teeb pom kev zoo), silicone-encapsulated LEDs nrog cov dab dej kub muaj zog muaj qhov zoo tshaj plaws rau kev ua neej ntev, yog xav paub ntxiv koj tuaj yeem mus ntsibhttp://www.benweilight.com
