This paper shows the differences in luminous fluxes of two distinguishing dual-layer remote phosphor structures. Flat Dual-Remote Phosphor (FDRP) and Concave Dual-Remote Phosphor (CDRP). The impact of the distance between the two phosphor layers (d_1) and the distance from the phosphor layer to the LED surface (d_2) on the optical properties of the CDRP is also presented. Specifically. https://www.diegojavierfares.com/