发射可变光谱功率分布（SPD）的照明产品在建筑照明市场中越来越普遍。虽然过去存在一些基于荧光灯技术的可变光谱产品，但固态照明（SSL）的功能使此类产品得以开发和广泛使用。然而，在现有的表征光度和电气性能的方法中，没有明确考虑可变光谱输出，这些方法侧重于在单一工作状态下进行的测量，产品提供预期电压，且没有控制装置。

Lighting products emitting variable spectral power distributions (SPDs) are increasingly prevalent in the architectural lighting marketplace. While a few variable-spectrum products based on fluorescent lamp technology existed in the past, the capabilities of solidstate lighting (SSL) have enabled the development and widespread use of such products. Variable spectral output, however, is not explicitly accounted for in existing methods for characterizing photometric and electrical performance, which are focused on measurements taken at a single operating state, with the product supplied with the intended voltage and without control devices.