We have got the chance last week to make test measurements on the stage of the Budapest Operett and Musical Theatre. A model of the solar panel was illuminated with high power dazzle lamps to check if we can reproduce light density expected in space. The test was totally successful, because the solar cells produced the nominal short-cut current, without warming up too much. After the flight model is ready we are planning to take the hardware to the stage to perform functional tests in this extraordinary „sun simulator”.