A method and device for interfering with or reducing the activity of one or more targets by over-stimulating the targets optic nerve with a high intensity incoherent light beam (HIILB) emanating from an electrode-free plasma (EFS) lamp. The steps of the method include providing a HIILB from an EFS lamp housed in a device and directing the beam at the one or more targets when facing the device. The device includes an outer housing with a head portion having a window opening for transmitting a HIILB, an optical system mounted in the head portion facing the window, one or more EFP lamps mounted at the focus of the optical system to collimate the light towards the window, an electrical circuit for driving the one or more lamps wherein the electrical circuit has an energy source and a plasma lamp induction coupling to the energy source for operation.
