An apparatus comprising: a) a light concentrator for concentrating and redirecting incident radiant energy, the light concentrator having an optical axis; b) a spectral separator spaced apart from the light concentrator and disposed along the optical axis and in the path of concentrated, redirected radiant energy, the spectral separator comprising: (i) a first planar surface treated to reflect a first spectral band of light received from the light concentrator toward a first focal region and to transmit a second spectral band; (ii) a second planar surface spaced apart from the first planar surface, wherein the second planar surface is treated to reflect the second spectral band back through the first planar surface and toward a second focal region that is spaced apart from the first focal region; and c) first and second light receivers (34,36), wherein the first light receiver is disposed nearest the first focal region for receiving the first spectral band and the second light receiver is disposed nearest the second focal region for receiving the second spectral band, and characterised in that the apparatus is for obtaining energy from the sun, the second planar surface is oblique with respect to the first planar surface; and the first and second light receivers (34,36) are photovoltaic, thermovoltaic or thermophotovoltaic devices for obtaining light energy from the wavelengths in the respective spectral bands from the sun. a) a light concentrator for concentrating and redirecting incident radiant energy, the light concentrator having an optical axis; b) a spectral separator spaced apart from the light concentrator and disposed along the optical axis and in the path of concentrated, redirected radiant energy, the spectral separator comprising: (i) a first planar surface treated to reflect a first spectral band of light received from the light concentrator toward a first focal region and to transmit a second spectral band; (ii) a second planar surface spaced apart from the first planar surface, wherein the second planar surface is treated to reflect the second spectral band back through the first planar surface and toward a second focal region that is spaced apart from the first focal region; and (i) a first planar surface treated to reflect a first spectral band of light received from the light concentrator toward a first focal region and to transmit a second spectral band; (ii) a second planar surface spaced apart from the first planar surface, wherein the second planar surface is treated to reflect the second spectral band back through the first planar surface and toward a second focal region that is spaced apart from the first focal region; c) first and second light receivers (34,36), wherein the first light receiver is disposed nearest the first focal region for receiving the first spectral band and the second light receiver is disposed nearest the second focal region for receiving the second spectral band, and characterised in that the apparatus is for obtaining energy from the sun, the second planar surface is oblique with respect to the first planar surface; and the first and second light receivers (34,36) are photovoltaic, thermovoltaic or thermophotovoltaic devices for obtaining light energy from the wavelengths in the respective spectral bands from the sun. wherein the first light receiver is disposed nearest the first focal region for receiving the first spectral band and the second light receiver is disposed nearest the second focal region for receiving the second spectral band, and characterised in that the apparatus is for obtaining energy from the sun, the second planar surface is oblique with respect to the first planar surface; and the first and second light receivers (34,36) are photovoltaic, thermovoltaic or thermophotovoltaic devices for obtaining light energy from the wavelengths in the respective spectral bands from the sun.