Measuring principle A low-cost but very accurate general-purpose silicon crystal sunlight intensity meter. The silicon crystal sunlight intensity meter is specially designed to be suitable for applications such as calculating evapotranspiration of precise irrigation systems, monitoring solar panels for power generation, and calculating atmospheric pollution diffusion. SP-Lite is suitable for all kinds of weather conditions. Under sunny and unobstructed natural light conditions, it is comparable to the first-level thermocouple sunshine intensity meter specified by ISO9060. SP-Lite uses a photoelectric detection element that can output a voltage proportional to the amount of incident radiation. This signal can be converted to a 0- by integrating with all Adcon amplifiers