本报告研究了可更换前照灯灯泡上单层和多层涂层的使用，以及此类涂层如何影响灯泡的光散射性能，这可能会导致前照灯中的眩光和光谱分离。开展了试验，以研究吸收和干扰（多层）涂层对灯泡以及前照灯系统中灯泡的影响。这些试验为拟议的灯泡分色试验提供了验证，该试验在SAE J578白色要求的范围内确定了光谱分离的限值。灯泡分色测试提供了一个确定的选择标准，用于识别在光学系统中导致过度光散射（眩光）和/或光谱分离的灯泡。

This report investigates the use of single and multi-layer coatings on replaceable headlamp bulbs and how such coatings can affect the performance of bulbs in terms of light scattering, which can contribute to glare, and spectral separation in headlamps. Tests were developed to investigate the effects of absorptive and interference (multi-layer) coatings on bulbs, and on bulbs in headlamp systems. These tests provide validation for a proposed bulb color separation test, which establishes limits for spectral separation within the boundaries of SAE J578 white color requirements. The bulb color separation test provides a definitive selection criterion to identify bulbs that cause excessive light scatter (glare) and/or spectral separation in an optical system.