基于LED的光源已经取代了大量传统光源。在欧洲领先的国家计量机构中实现的计量溯源链使用绝对校准的宽带辐射计（三元件硅陷阱探测器）校准主光度计。白光LED的特殊光谱特性允许将陷阱探测器直接用作新的主光度计。使用未过滤技术（Donsberg等人，2014年），需要校准光谱辐照度响应度。我们在基于探测器的光谱辐照度响应度校准方面有着长期的经验，这些校准由发表在BIPM KCDB上的特定CMC宣布。这项工作的目的是修订不确定度预算，以减少校准基于陷阱的未过滤初级光度计UPP的特定应用的测量不确定度。这两种校准方法用于分析UPP前孔径偶尔的后反射效应。 使用我们的参考光谱响应度设备在350 nm-900 nm的光谱范围内进行测量。

LED-based light sources have replaced massively traditional sources. The metrology traceability chains realised in leading European NMIs utilise the absolutely calibrated broadband radiometers (three-element silicon trap detectors) for calibrating primary photometers. Specific spectral properties of white LED allow to apply the trap detectors directly as new primary photometers. The unfiltered technique (Donsberg at al., 2014) is used and the calibration of spectral irradiance responsivity is needed. We have a long experience in detector-based spectral irradiance responsivity calibrations declared by particular CMCs published in BIPM KCDB. The aim of this work was to revise the uncertainty budget in order to reduce the measurement uncertainties for specific application of calibration of the trap-based unfiltered primary photometers UPP. The two calibration methods were used to analyse the occasional back-reflection effect of the UPP front aperture. The measurement was performed using our reference spectral responsivity facility in spectral range 350 nm - 900 nm.