Abstract: The concentrated PV solar power stack system includes a solar concentration assembly, HC sunlight transmission light pipe and a LEC stack assembly holding a plurality of light-to-electricity conversion (LEC) cells inside a compact weatherproofed housing enclosure. Each single LEC cell includes one LD panel having one light-emitting side and one PV solar panel adjoining the said LD panel; alternatively, a double-sided LD panel capable of emitting solar radiation evenly on both sides and two adjoining PV panels on each of the outer side of the said LD panel form a double LEC cell. A spectral & thermal conditioning system of the HC solar radiation beam represented by a combination of spectral cooling and heat sink devices reduces the thermal load in the LEC stack assembly and also improves the its light-to-electricity conversion rate.