LED灯具的性能评估白皮书（英文版）.pdfVIP

研报客 LED Luminaires White paper Evaluating performance of LED based luminaires 研报客 2. IEC performance criteria 2.2 IEC ‘over time’ performance criteria Both ‘initial’ and ‘over time’ performance have to be There are two relevant ‘over time’ performance values to evaluated in order to have confidence how LED based be considered related to gradual and abrupt light output luminaires will perform and how long they will sustain their degradation of a LED based luminaire at rated life. rated characteristics over their years of operation. At present, it can be difficult to know who to trust or what to believe. new gradual abrupt Standardization of performance requirements is an important first step towards full transparency regarding the performance of LED based luminaires used in the professional market. Therefore, the IEC recently developed and published specific performance standards for LED based luminaires. These standards describe how to measure ‘initial’ performance and provide a lifetime metric for ‘over time’ performance. or It should be noted that initial product specifications will typically be measured, whereas performance over time will LED luminaire lumen depreciation