The popularity of LED-based luminaires has increased enormously in recent years. Every such luminaire consists of several elements including a polymer-based transparent housing, yet some of the ageing aspects of specific luminaire materials have not been investigated. In this paper, we present research aimed at determining the impact of LED lamp powering mode on polymer material deterioration. In the experiment, three LED lamp operating systems based on two different pulse width modulation units and one DC power source were used to induce deterioration in a polymethyl methacrylate sample. Two types of LEDs, white and ultraviolet, were considered as the most significant in terms of the impact on the material. Observations of the surface's morphological changes were performed to enable non-destructive investigation of the degradation of the exposed samples. In order to obtain high roughness detection sensitivity, atomic force microscopy was used. We observed various ageing ratios of the material, despite the fact that total average optical energy for specific wavelengths was equal for all samples. The importance of these findings for designing modern luminaires is discussed.

中文翻译：

---

基于 LED 的光源工作方式对聚甲基丙烯酸甲酯降解的影响

近年来，基于 LED 的灯具的普及程度大大提高。每个这样的灯具都由几个元素组成，包括基于聚合物的透明外壳，但尚未研究特定灯具材料的某些老化方面。在本文中，我们的研究旨在确定 LED 灯供电模式对聚合物材料劣化的影响。在实验中，使用基于两个不同脉宽调制单元和一个直流电源的三个 LED 灯操作系统来诱导聚甲基丙烯酸甲酯样品的劣化。就对材料的影响而言，白光和紫外光两种类型的 LED 被认为是最重要的。表面观察' 进行形态学变化以实现对暴露样品降解的非破坏性研究。为了获得高粗糙度检测灵敏度，使用了原子力显微镜。尽管所有样品的特定波长的总平均光能相等，但我们观察到材料的各种老化率。讨论了这些发现对于设计现代灯具的重要性。