a spectrum manipulation device and method for increasing an energy conversion efficiency of a photovoltaic cell arrangement , the device including : a black body adapted to absorb an input electromagnetic energy having an input energy flux spectrum , and to emit a first output electromagnetic energy having a different , output energy flux spectrum ; a transparent cover , adapted to thermally insulate the black body from an ambient environment , and to receive light and direct the light towards the black body ; an optical device , facing the black body , and adapted to : receive the first output energy and emit a second output electromagnetic energy having a narrow , modified energy flux spectrum , with respect to the output energy flux spectrum , and recycle some of the first output electromagnetic energy to the black body ; a photovoltaic cell having a photon absorption surface , disposed to be in optical communication with the optical device , and a housing containing the black body and the optical device , and adapted to thermally insulate the black body and to fix a position of the black body with respect to the optical device , the optical device further adapted to direct the second output energy towards the photon absorption surface .