Arc modular light devices, systems, and methods. In at least one exemplary embodiment of a module system of the present disclosure, the module system comprises a plurality of LED modules, each LED module comprising an outer housing, a light source positioned within the outer housing, and a lens positioned so that light from the light source can be emitted through the lens； and a flexible plate configured to couple to each of the plurality of LED modules； wherein the module system is configured to focus light from the LED modules inward when the flexible plate is curved in a first direction； and wherein the module system is configured to spread light from the LED modules outward when the flexible plate is curved in a second direction opposite the first direction.
