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Producing silver nanoparticles (AgNPs) of homogenous shapes and sizes that are stable for oxidation remains challeng-ing. A fast and accessible synthesis is presented to tune the homogeneity of triangular plates (AgNPLs) using light. This study showed AgNPs of varying shapes (spheres, rounded triangles, and rods), sizes (10-20 nm, 40 nm, and 33 nm, re-spectively), and surface chemistry (citrate and PVP capping agents) undergo a light-induced conversion to 75-85% sharp AgNPLs with narrow-localized surface plasmon resonance (LSPR) band with λmax at 680 nm and an average edge length of 40 nm ± 5.6 nm as confirmed by UV-Vis spectroscopy and transmission electron microscopy (TEM) respectively. Fur-ther exploration into the mechanism confirmed that Ag+ ions, O2, and light are critical parameters for the light-induced transformation of AgNSs to AgNPLs. Under an inert atmosphere, shape transformation is inhibited, reinforcing the essen-tial role of O2 in the process. More remarkably, when AgNPs of any size or shape are coated with a hybrid lipid-coated membrane, the AgNPs had exceptional photostability, showing no change LSPR band, underscoring their resistance to photooxidation and shape transformation even in the presence of excess Ag+ ions, O2, and AgNSs. The results highlight the importance of light in tuning the homogeneity of AgNPs and the superior stabilizing effect of hybrid lipid membranes.