相关色温的计算(Correlated Colour Temperature)

input X        

input Y        

output n      

output CCT

参考公式：

$$C C T = - 437 n ^ { 3 } + 3601 n ^ { 2 } - 6861 n + 5514.31$$ $$n = ( x - x _ { e } ) / ( y - y _ { e } )$$ $$x _ { e } = 0.3320 , y _ { e } = 0.186$$

参考文献：

Zhao, Rongli, et al. Thermally-stable novel NaBaBi₂(PO₄)₃: Sm³⁺/Dy³⁺ white phosphors with tunable photoluminescence. Ceramics International, 49.15 (2023): 25795-25805.