What is the fine-grained topic of the following text: The research team intends to lower the integral costs of PV-modules, by developing a worldwide unique AAA-class In-Line steady state solar simulator (ILSS) prototype for the PV-industry that is validated on criteria for test speed (5 modules/minute), test accuracy, heat development, maintenance and lamp replacement costs. Only return the topic.
Development of an In-Line steady state solar simulator for the PV-industry