A power supply configured to be applied to multiple loads being light source modules, comprising a first connector, a controller, at least one isolated power supply, and at least one non-isolated power supply (3, 4) parallel with the at least one isolated power supply, wherein, the first connector is electrically connected with the at least one isolated power supply and the at least one non-isolated power supply (3, 4), and is used for being electrically connected with the controller, in order to adjust power states of the at least one isolated power supply and the at least one non-isolated power supply (3, 4) by receiving a power supply control signal from the controller; wherein the at least one isolated power supply and the at least one non-isolated power supply (3, 4) are configured to work independently from each other; the at least one isolated power supply and the at least one non-isolated power supply (3, 4) are respectively connected with load circuits which correspond to the at least one isolated power supply and the at least one non-isolated power supply (3, 4), to supply power to the load circuits, and control working states of the load circuits connected to the at least one isolated power supply and the at least one non-isolated power supply (3, 4) according to the power states of the at least one isolated power supply and the at least one non-isolated power supply (3, 4); and the at least one isolated power supply, the at least one non-isolated power supply (3, 4) and the first connector are all arranged on a same circuit board, characterized by: a PFC circuit and an auxiliary power supply circuit connected with the PFC circuit, wherein, the PFC circuit is configured to receive supplied power of an external power supply, and to utilizes the supplied power of the external power supply to supply power to the auxiliary power supply circuit, the at least one isolated power supply, the at least one non-isolated power supply and the load circuits; the auxiliary power supply circuit receives supplied power of the PFC circuit, and supplies power to the at least one isolated power supply, the at least one non-isolated power supply and the controller. the first connector is electrically connected with the at least one isolated power supply and the at least one non-isolated power supply (3, 4), and is used for being electrically connected with the controller, in order to adjust power states of the at least one isolated power supply and the at least one non-isolated power supply (3, 4) by receiving a power supply control signal from the controller; wherein the at least one isolated power supply and the at least one non-isolated power supply (3, 4) are configured to work independently from each other; the at least one isolated power supply and the at least one non-isolated power supply (3, 4) are respectively connected with load circuits which correspond to the at least one isolated power supply and the at least one non-isolated power supply (3, 4), to supply power to the load circuits, and control working states of the load circuits connected to the at least one isolated power supply and the at least one non-isolated power supply (3, 4) according to the power states of the at least one isolated power supply and the at least one non-isolated power supply (3, 4); and the at least one isolated power supply, the at least one non-isolated power supply (3, 4) and the first connector are all arranged on a same circuit board, characterized by: a PFC circuit and an auxiliary power supply circuit connected with the PFC circuit, wherein, the PFC circuit is configured to receive supplied power of an external power supply, and to utilizes the supplied power of the external power supply to supply power to the auxiliary power supply circuit, the at least one isolated power supply, the at least one non-isolated power supply and the load circuits; the auxiliary power supply circuit receives supplied power of the PFC circuit, and supplies power to the at least one isolated power supply, the at least one non-isolated power supply and the controller.