A leak detector includes an inlet, a high-vacuum pump, and a test gas detector, which is connected to the entry of the high-vacuum pump. In a power-save mode, the processor is able to generate one or more core clock signals at frequencies such that the lowest core clock signal frequency is lower than the predetermined multiple of the lowest of the one or more bus clock signal frequencies in performance mode. Each pixel represents collective irradiance that is converted into point clearness indexes for the points within the bounded area relative to clear sky irradiance. A first body contact layer may extend across the first semiconductor layers.