Thaum cov kws tshaj lij tsim cov yeeb yaj kiab hloov mus rau LED qab nthab teeb pom kev zoo, lawv feem ntau ntsib qhov tsis txaus ntseeg: thaum kuaj tag nrho cov kev daws teeb meem, zaj duab xis coj los rau hauv lub teeb uas zoo li ruaj khov rau lub qhov muag tsis pom kev qhia tawm suab paj nruag, strobing, lossis raug hloov pauv. Tus tsav tsheb LED txoj kev tswj xyuas tam sim no yog lub luag haujlwm ncaj qha rau qhov teeb meem, uas yog lub teeb ci ntawm lub cev hloov pauv. Txhawm rau xaiv qhov zoo tshaj plawsLED batten fixturerau tus neeg teb xov tooj studio, podcast presenter, tuam txhab videographer, lossis cov neeg tsim khoom tsim cov chaw tsim khoom tshwj xeeb nrog cov nyiaj siv ua haujlwm saum taub hau, nws yog qhov tsim nyog yuav tsum nkag siab tsib yam txuj ci sib txawv uas tsis tshua muaj qhov tseem ceeb hauv cov ntaub ntawv luminaire. Qhov kev qhia no piav qhia txog cov kev xav tau no yog dab tsi, cov duab dab tsi los thov, thiab yuav ua li cas kom paub meej lawv ua ntej ua kev lag luam.
Cov laj thawj tom qab LED Batten Fixtures 'Lub Koob Yees Duab Flickering
Pulse Width Modulation (PWM), lub thev naus laus zis uas hloov pauv LED sai sai ntawm tag nrho rau thiab tag nrho ntawm qhov zaus tau txiav txim siab los muab qhov pom tsis pom tseeb, yog siv rau dimming hauv feem ntau ntawm cov teeb pom kev zoo ntawm LED teeb pom kev zoo rau kev lag luam dav siv. Qhov feem pua ntawm lub sij hawm siv nyob rau hauv lub xeev "on" (lub luag hauj lwm voj voog) yog correlated nrog lub perceived brightness. Flicker tshwm raws li cov nyhuv strobe rau tib neeg lub qhov muag ntawm PWM zaus qis dua li ntawm 100 Hz. Cov neeg feem coob tsis tuaj yeem pom nws ntawm 100 Hz thiab 1.25 kHz, tab sis cov koob yees duab tseem tuaj yeem ntes nws, tshwj xeeb tshaj yog nyob rau ntawm tus nqi siab dua lossis thaum ua ke nrog qee qhov kev kaw nrawm. Cov peev txheej nrog 100% kev hloov pauv qhov tob, xws li PWM dimmers, feem ntau tau txais dhau 1.25 kHz, txawm hais tias cov teebmeem stroboscopic residual ntawm cov khoom txav mus los tseem pom tau txog 3 kHz thiab tej zaum siab dua.
Lub xub ntiag ntawm banding hauv video yog txiav txim los ntawm kev sib raug zoo ntawm PWM zaus thiab lub koob yees duab shutter ceev. Lub koob yees duab kaw qhov sib txawv ntawm LED lub voj voog qhib / tawm hauv cov kab sib txawv yog tias lub voj voog PWM thiab lub koob yees duab lub voj voog kaw tsis nyob rau hauv zoo meej synchrony lossis tag nrho - tus lej piv. Qhov no ua rau cov thav ntawv nrog qhov sib txawv ntawm qhov ci thiab qhov txawv txav ntawm qhov sib txawv los yog flickering raug cuam tshuam uas cuam tshuam lwm cov duab meej. Qhov teeb meem no hnyav dua nrog siab -thav duab- tus nqi yees duab (120 fps, 240 fps, lossis siab dua rau qeeb- cov ntawv thov kev txav) vim qhov tsis sib xws ntau dua vim qhov luv luv ntawm qhov sib txawv -frame.
Kev pheej hmoo tshwj xeeb rau cov koob yees duab: Siab Shutter Ceev thiab Ncej Tus Nqi
Nrog rau kev sib tw khiav ntawm 500 Hz PWM, zaus tshaj tawm raws li "flicker-dawb" rau tib neeg qhov muag kev nplij siab, tus qauv tshaj tawm video ntawm 24 lossis 30 thav duab ib ob yuav ua rau muaj teeb meem. Vim tias lub koob yees duab siv 120 duab ib ob, txhua qhov sib koom ua ke dhau lub qhov rais kaw luv luv, 500 Hz PWM tseem tsis txaus rau siab - video ceev ntawm 120 ntas ib ob. Cov kws tshaj lij teeb pom kev zoo uas tshwj xeeb hauv kev ua yeeb yaj kiab thiab thaij duab qhia siv cov tsav tsheb LED nrog PWM zaus tsawg kawg yog 25,000 Hz (25 kHz). Qhov zaus no tshem tawm qhov teeb meem thib ob ntawm PWM-induced buzzing los ntawm cov khoom tsav tsheb thiab dhau ntawm tib neeg lub suab, yog li txawm tias siab -thav duab- tus nqi thiab siab - shutter- daim ntawv thov ceev tsis muaj qhov cuam tshuam qhov muag pom.
Tsib yam cuam tshuam rau Flicker Performance
LED batten qhov tsim nyog rau daim ntawv thov kev tsim tawm video yog txiav txim siab los ntawm tsib yam txheej txheem.
1. PWM Dimming Frequency: yam tsawg 25 kHz
Qhov kev xav tau tseem ceeb tshaj plaws rau lub koob yees duab xwm txheej yog qhov no. Rau yuav luag txhua qhov tseeb ncej tus nqi thiab shutter ceev ua ke nyob rau hauv kev yees duab ntau lawm, tus tsav tsheb khiav ntawm 25 kHz los yog saum toj no tshem tawm lub koob yees duab- pom flicker. Fixtures muag nrog PWM zaus ntawm 200 thiab 400 Hz yog qhov tsim nyog rau ob qho tib si tib neeg pom kev nplij siab thiab kev siv dav hauv kev lag luam, txawm li cas los xij lawv tuaj yeem ua rau cov khoom cuav thaum ntes tau los ntawm siab - lub koob yees duab ceev. PWM zaus yuav tsum tau thov los ntawm tus tsav tsheb datasheet es tsis yog daim ntawv qhia luminaire, uas feem ntau tawm cov ntaub ntawv no tawm.
2. Flicker feem pua: Tsawg dua lossis sib npaug li 5%
Lub amplitude ntawm lub teeb tso zis modulation yog ntsuas los ntawm Percent Flicker (PF), uas yog ib feem uas sawv cev rau qhov piv ntawm qhov sib txawv ntawm qhov siab tshaj plaws thiab yam tsawg kawg nkaus brightness rau lawv tag nrho. Ib tus lej ntawm 100% txhais tau hais tias qhov chaw txav los ntawm tag nrho mus rau tag nrho txhua lub voj voog, thaum tus nqi ntawm 0% qhia cov zis uas tas li. Lub hom phiaj pib rau ib puag ncig video yog PF ntawm 5% ntawm txhua zaus hauv qab 200 Hz; qhov no sib raug rau qhov "flicker-}dawb" kev faib tawm siv nyob rau hauv California txoj cai Title 24 lub tsev txoj cai, uas txuas ntxiv mus ua ib qho kev nruj tshaj plaws tsim -ib puag ncig flicker xav tau thoob ntiaj teb. Nws yuav tsum raug sau tseg tias PF los ntawm nws tus kheej tsis txaus: qhov chaw nrog 10% kev hloov kho ntawm 50 Hz yog teeb meem, tab sis qhov chaw nrog 100% kev hloov kho ntawm 30 kHz yog ob lub koob yees duab- nyab xeeb thiab tib neeg- nyab xeeb. Ntau zaus thiab PF yuav tsum tau soj ntsuam ua ke.
3. SVM (Stroboscopic Visibility Measure): <0.4
Cov nyhuv stroboscopic, lossis qhov ua tau tias cov khoom txav yuav zoo li stutter, khov, los yog tsim cov duab dab nyob rau hauv lub teeb flickering, yog ntsuas los ntawm SVM, ib tug perceptual metric. Nyob rau hauv cheeb tsam ntawm 80 Hz mus rau 2 kHz, qhov twg stroboscopic teebmeem yog feem ntau physiologically active, nws muaj xws li modulation qhov tob thiab zaus weighted tiv thaiv tib neeg kev pom system rhiab heev. Qhov nruab nrab tus neeg soj ntsuam qhov pom qhov pib yog sawv cev los ntawm tus nqi SVM ntawm 1.0; Cov txiaj ntsig ntau dua 1.0 qhia tau tias pom tau stroboscopic artefacts. Lub hom phiaj rau video studios thiab tshaj tawm cov xwm txheej yog SVM Tsawg dua lossis sib npaug li 0.4, uas muaj qhov tsis zoo rau cov teebmeem stroboscopic rau ob qho tib si txav cov ntsiab lus ntes tau ntawm lub koob yees duab thiab tib neeg cov neeg nyob hauv. Rau siab -kev ua haujlwm muaj tseeb uas xav tau cov cuab yeej spinning, qib no kuj tau qhia.
4. Xim Rendering: R9 Ntau dua lossis sib npaug rau 50, CRI Ntau dua lossis sib npaug rau 90
Tsuas yog thaum lub teeb ci qhia meej meej txhua yam ntawm cov khoom siv spectral tuaj yeem thaij duab thaij duab thiab luam xim. Cov tawv nqaij tones, xim khaub ncaws, cov khoom hues, thiab ib puag ncig yog txhua yam kev ncaj ncees rov ua dua los ua kom pom cov ntsiab lus hauv lub teeb pom kev zoo thaum CRI yog 90 lossis siab dua. Cov txheej txheem zoo tshaj plaws yog CRI 95 lossis siab dua, nrog R9 (qhov sib sib zog nqus liab)> 50, rau cov xwm txheej studio uas muaj xim ncaj ncees yog tus nqi tsim khoom, xws li kev sib tham, kev nthuav qhia khoom, thiab kev siv tshuaj pleev ib ce. Lwm qhov laj thawj ntawm kev tsav tsheb zoo yog qhov tseem ceeb thaum xaiv cov khoom siv hauv studio yog tias siab -CRI phosphor LEDs feem ntau xav tau tus tsav tsheb ceev faj me ntsis kom tswj tau qhov CCT tsis tu ncua hauv qab dimming. TLCI ntawm 90+ raug pom zoo rau cov ntawv tshaj tawm tshaj tawm. TLCI (TV Lighting Consistency Index) yog ib qho piv txwv ntawm cov txheeb cais uas tau dhau los ua neeg nyiam thiab tshwj xeeb tshaj yog calibrated rau tshaj tawm lub koob yees duab teb.
5. UAS <19
Unified Glare Rating (UGR) ntsuas qhov tsis xis nyob glare rau cov neeg nyob hauv thaj chaw kaj. UGR Tsawg dua lossis sib npaug li 19 txo qis, cov tub ntxhais kawm reflexes uas cuam tshuam rau lub koob yees duab tsom, thiab tsis xis nyob thaum lub sijhawm ntev hauv lub studio qhov chaw uas cov neeg ua yeeb yam, tus tshaj tawm, lossis cov ntsiab lus tau muab tso rau hauv qab lub teeb ci ntsa iab thiab cov neeg ua haujlwm lub koob yees duab yuav tsum saib xyuas kom meej. Qhov ci ntsa iab ntawm lub teeb, geometry ntawm chav tsev, thiab qhov cuam tshuam ntawm qhov chaw tag nrho cuam tshuam UGR; Txawm li cas los xij, ib daim ntawv teev cov ntaub ntawv UGR tus nqi, uas feem ntau tau muab rau ib chav tsev tshwj xeeb, muaj cov ntsiab lus tseem ceeb rau kev sib piv.
Qhov sib txawv ntawm qhov sib txawv ntawm PWM Dimming thiab cov tsav tsheb tsis tu ncua
Kev txo tam sim no tsis tu ncua (CCR) dimming, feem ntau hu ua analogue dimming, yog lwm txoj hauv kev rau PWM dimming uas txo qis LED ci ntsa iab los ntawm kev txo qhov tsav tam sim no es tsis txhob tig rau thiab tawm. Los ntawm kev txhais, CCR tsim xoom kev hloov pauv ntawm kev tsav tsheb zaus; rau txhua qib dimming, cov zis yog qhov tas li. Kev lag luam tawm -tawm yog tias tam sim no poob qis, CCR tsim qhov hloov me me hauv CCT (LEDs txav sov dua ntawm cov dej ntws qis), uas tuaj yeem tsim teeb meem calibration hauv studio chaw uas xim yog qhov tseem ceeb. Cov txheej txheem hybrid yog siv los ntawm tej yam zoo - LED tsav tsheb zoo, uas hloov los ntawm analogue dimming ntawm lub teeb siab dua thaum CCT hloov yog pom tau tias mus rau siab - zaus PWM (Ntau dua los yog sib npaug rau 25 kHz) nyob rau hauv qis dua qhov twg CCT hloov los ntawm CCR yog ntau pom. Paub qhov twg dimming topology tus tsav tsheb siv yog qhov tseem ceeb raustudio batten fixturesuas yuav yog xim- sib phim thiab dimmed thaum lub sijhawm tsim khoom.
