Incazelo ye-Luminous Intensity
- Ulwazi oluyisisekelo lwe-LED
1. Ukuhlaziywa kwamayunithi wokulinganisa amandla okukhanya asetshenziswa ngokuvamile
Iyunithi yokulinganisa yamandla akhanyayo womzimba okhanyayo yile:
1. Iyunithi yokukhanyisa: Lux
2. Iyunithi ye-flux ekhanyayo: I-Lumen
3. Iyunithi yokuqina okukhanyayo: Amandla ekhandlela
Lapha qala uchaze i-1CD (ukukhanya kwekhandlela: i-Candela): ibhekisela entweni ekhishwe imisebe ngokuphelele, endaweni yokuqhwa ye-platinum, ukuqina okukhanyayo kwayo yonke indawo yamasentimitha-skwele angamashumi ayisithupha.
Chaza futhi 1Lux (lux): ibhekisela ekukhanyeni lapho ukukhanya okukhanyayo okutholwa ngemitha yesikwele kuyi-lumen engu-1. Ubudlelwano phakathi kokukhanya, ukukhanya nebanga yilokhu: E (ukukhanya) = I (ukukhanya)/r2 (ibanga eliyisikwele)
Ekugcineni, chaza i-1L (lumens): ukukhanya okukhanyayo kwekhandlela le-CD elingu-1 elikhanyiselwe endizeni enebanga elingu-1 cm nendawo engu-1 cm 2.
2. Amayunithi okukhanya kwe-LED okuqeda ukungabaza
Izikhanyisi ezisebenzayo njengama-LED namalambu e-incandescent zisebenzisa ukukhanya kwekhandlela (CD) njengeyunithi yokuqina kokukhanya. Amayunithi okuguquguquka akhanyayo (L) asetshenziselwa izinto ezikhanyayo noma ezingenayo. Iyunithi yokukhanyisa i-Lux isetshenziswa ekuthwebuleni izithombe nakweminye imikhakha. Lawa mayunithi amathathu okulinganisa ayalingana ngezinombolo, kodwa adinga ukuqondwa ngama-engeli ahlukene. Isibonelo, ukukhanya (ukukhanya okukhanyayo) kweprojektha ye-LCD kungu-1600 lumens. Uma ikhonjiswa kusikrini sokubonisa esingama-intshi angu-60 (1 square metre) yonke, ukukhanya kuyi-1600 lux. Uma sicabanga ukuthi indawo yokukhanya iqhele ngo-1 cm ukusuka emthonjeni wokukhanya futhi indawo yokukhanya ingu-1 cm2, khona-ke ukuqina okukhanyayo kwe-outlet yokukhanya kungu-1600CD. Kodwa-ke, eqinisweni, ngenxa yokulahlekelwa ukudluliswa kokukhanya, ukubonakaliswa noma ukulahlekelwa kwefilimu yokudlulisa ukukhanya yeprojektha ye-LCD, ukukhanya kwayo kungafinyelela ukusebenza kahle kwama-50%. Ngokolwazi lwamanje lohlelo lokusebenza, isikrini sokubonisa se-LED sangaphandle kufanele sibe nokukhanya okungaphezu kuka-4000CD/m2 ukuze sithole umphumela wokubonisa ongcono kakhulu ngaphansi kokukhanya kwelanga. Kuma-LED ajwayelekile angaphakathi, ukukhanya okuphezulu cishe ku-700 kuya ku-2000 CD/m2.
Okokugcina, kufanele kuqashelwe ukuthi ukukhanya okukhanyayo okunikezwe umkhiqizi we-LED kubhekisela endaweni lapho i-LED ikhanya khona njengamanje engu-20 mA, kanye nokukhanya okukhanyayo ku-engeli engcono kakhulu yokubuka kanye nendawo emaphakathi inkulu kakhulu. Ngale ndlela, nakuba ukukhanya okukhanyayo kwe-LED eyodwa kukuyunithi ye-CD, ukuqina kwayo okukhanyayo akunabudlelwane nombala we-LED. Ngokuvamile, ukuqina okukhanyayo kweshubhu elilodwa kufanele kusuke ku-mCD embalwa kuye ku-5000mCD.
