AN EXPERIMENTAL EVALUATION OF PHOTOMETRIC PERFORMANCE AND POWER QUALITY OF LED LAMPS IN DIFFERENT OPERATING CONDITIONS

Authors

Electrical Engineering Department, Faculty of Engineering, Minia University, Minia, Egypt.

Abstract

             Due to the global interest of Light Emitting Diode (LED) Technology, LED lamps manufacturers and academic researchers are doing great efforts to study different aspects of LED lamps performance. This paper investigates the photometric and electrical properties of LED lamps. The effect of temperature on the output light emitted from the LED lamps has been studied and a model of LED lamp is simulated and presented in this manuscript. The presented model has been implemented experimentally to investigate the lamp performance. Experimental results show that the effect of aging test on photometric parameters of LED lamp such as luminous flux, correlated color temperature (CCT), color rendering index (Ra). This study enables to understand and well control the features of the visible light emitted from LED lamps. The value of CCT is an important parameter in many applications such as lighting, videography, photography, publishing, horticulture, and manufacturing. It is desirable to achieve a high CRI light in color-critical applications such as neonatal care in hospitals). Experimental results also demonstrate that PF of LED lamp driver decrease when the lamp is operated in high ambient temperature.

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References

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تقییم معملی للأداء الضوئی وجودة القدرة للمبات الصمامات الثنائیة الباعثة للضوء فی ظروف تشغیل مختلفة
نظرًا للاهتمام العالمی بتکنولوجیا الإضاءة الباعثة للضوء (LED) ، یبذل مصنعو لمبات LED والباحثون الأکادیمیون جهودًا کبیرة لدراسة کل جانب من جوانب أداء هذا النوع من اللمبات.
تبحث هذه الرسالة فی الخصائص الضوئیة والکهربائیة للمبات LED. وقد تمت دراسة تأثیر درجة الحرارة على الضوء المنبعث منها، وتم محاکاة نموذج لمبات LED فی هذه الرسالة. کما قدمت أیضا الرسالة نتائج تجریبیة لتأثیر اختبار التقادم (مرور الزمن) على المتغیرات الضوئیة للمبات LED مثل التدفق الضوئی ودرجة حرارة اللون (CCT) ومؤشر تقدیم اللون (CRI).
تمکن هذه الدراسة من فهم ومراقبة الضوء المرئی المنبعث من لمبات LED وتعد مهمة فی العدید من التطبیقات حیث أن معامل درجة حرارة اللون CCT)) معامل هام فی مجالات الإضاءة والفیدیو والتصویر الفوتوغرافی والصناعة کما أنه من المرغوب فیه أیضا تحقیق قیمة عالیة فی مؤشر تقدیم الألوان ((CRI وذلک فی التطبیقات الحساسة للون مثل العنایة بالأطفال حدیثی الولادة فی المستشفیات.
وقد أثبتت النتائج التجریبیة أیضًا أن معامل القدرة لللمبة LED ینخفض إلى ​نسبة تصل إلى 26% تقریبًا عن قیمته المقننة عند تشغیله فی درجات حرارة عالیة.
 

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