The effect of the phosphor curvature in the range 0. (YAlSiON) for YAG were assessed under the same phosphor curvature of 0.2589 mm -1 and the similar CCT~6350 K. Taking the luminous efficacy, preparation cost of phosphors, and CRI into consideration, we suggest that the YGdAG is a preferable candidate for replacing the YAG for use in WLEDs among the four kinds of phosphors. Compared with the YAG (7.5 wt%)-based WLED, the YGdAG (7 wt%)-based WLED exhibited an improved CRI, less preparation cost of phosphors, and the acceptable reduction in luminous efficacy under 350 mA.