相关色温相同的三基色灯应有相近的发光色，俗称“进圈”。三基色粉制造厂家如何科学、直观的标出，制灯厂家又如何选择？本文论述用色温或ｘ、ｙ色坐标作为控制指标的不合理性，提出在均匀颜色空间用“离中心色坐标”的色差表示，指出粉的种类、粒度等影响粉与灯发光色对应关系。 Related color temperature of the same three primary colors should have a similar light color, commonly known as “into the ring.” Three-color toner manufacturers how scientific and intuitive marked, manufacturers and how to choose lamp? This paper discusses the irrationality of using color temperature or x, y color coordinates as the control index, and proposes the color difference representation of “off center color coordinate” in uniform color space. The relationship between powder and lamp luminescence color is pointed out.