Measurement uncertainties which cased by LED orientation uncertainty,spectrum mismatch and LED fast test voltage pulse in the PLF on-line test are analyzed.

• 分析了LED定位不确定度,探头光谱失配和LED快速测试上电脉冲三方面对LED在线测试中部分光通量(PLF)测量不确定度的影响,并对光强分布为叶子形的LED进行了计算与实验。