“Metal halides have gained global attention as outstanding optoelectronic materials. Over the past decade, research has made significant strides, particularly in color-conversion applications. The discovery of self-trapped exciton (STE) emission in perovskites has sparked interest in using metal halides for broadband lighting. This review provides a comprehensive overview of metal halide STE emitters for lighting applications, highlighting ideal spectral characteristics, mechanisms, optimization strategies, and recent advances. It also outlines challenges and future trends, aiming to facilitate commercialization.”