210 is made can have thermally insulating properties an example of such a thermally insulating optically transmissive material is glass alternatively the reflective surfaces 218 219 can comprise mirrors for example a reflective coating comprising a dielectric or metals such as aluminum or silver can be applied to reflective surfaces 218 219 of the optically transmissive material the light conditioning element 210 can also be made of metal or any other suitable material attachable to the light guide 104 and may be coated with a reflective material turning to fig3 there is shown a cross section of a solar concentrator device 300 differing from the embodiment of fig1 only in that the overall thickness of the redirecting layer 308 is equal to the center thickness of the lenses and the solar energy collector 102 is a photovoltaic cell 302 in this embodiment the overall thickness of the solar concentrator device 300 decreases as one moves outward from the central axis 136 or central plane 137 to the peripheral edge 126 each of the reflector elements 106 can be the same size and shape as shown in fig3 however in an alternative embodiment the reflector elements 106 can vary in shape moving from the central axis 136 or central plane 137 to the peripheral edge 126 the reflector elements 106 reflect the light 131 from a corresponding lens 316 fig4 shows a cross sectional view of a solar concentrator device 1900 differing from the solar concentrator device 300 illustrated in fig3 only in that the.