A numerical and optimization study has been well performed on both the circadian effect and color gamut of laser-based displays (LBDs) consisted of multiple-primary laser diodes (LDs) to realize the ultra-wide color gamut. The LBDs mainly consist of red (R). green (G). and blue (B) LDs (namely by 3-LD scheme). https://halohealthcarers.shop/product-category/bath-chairs/