A micro-sized gas detecting device with two electrodes separated by a gap of width ranging from 1 to 500 microns, where the detection is based on emission spectroscopy of gases in an electric discharge across the gap as the gas flows through the region. The circuit device comprises: a highlow beam switching delay circuit, and an HID lamp set power supply circuit. The implants containing the therapeutic agent and auxiliary agent may be placed in an eye to treat one or more ocular conditions while reducing the ocular side effects otherwise accompanying the use of such therapeutic agent. When the data management unit sends a testing instruction to the cabinet, the control unit controls the power switch to shut down the external power supply such that the cabinet is powered by the uninterruptible power supply apparatus instead.