Abstract: In illustrative modes of practice, heliostat devices integrate light reflecting panels with a composite supporting structure that helps to provide the resultant assembly with structural integrity and stiffness. Light reflecting panels are coupled to the supporting, composite structure by a plurality of flexible connecting elements. Advantageously, the composite approach of the present invention effectively separates structural and thermal compensation functions. Specifically, the composite support structure helps to provide desired structural properties. In the meantime, the flexible connecting elements couple the top, light reflecting panel to the support structure in a manner that helps to isolate the top, light reflecting panel from thermal stresses that otherwise could cause undue slope errors.