TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: In the photovoltaic device, the solarization-stabilized silicate glass shows, regardless of the insolated UV power, a saturation of the solarization effect, with the transmission for saturated solarization dropping, in comparison to an unirradiated glass, by at most 0.03 on average over the wavelength range between 300 and 400 nm. The solarization-stabilized silicate glass contains titanium oxide in an amount of 0.005 weight percent on oxide basis. The solarization-stabilized silicate glass is a borosilicate glasses comprising, in weight percent on oxide basis: silicon dioxide (SiO2) 65-85 weight percent, boron oxide (B2O3) 7-15 weight percent, aluminum oxide (Al2O3) 0-10 weight percent, sodium oxide (Na2O) 2-13 weight percent, potassium oxide (K2O) 0-11 weight percent, cesium oxide (Cs2O) 0-11 weight percent, magnesium oxide (MgO) 0-0.5 weight percent, calcium oxide (CaO) 0-3 weight percent, strontium oxide (SrO) 0-0.5 weight percent, barium oxide (BaO) 0-6 weight percent, titanium dioxide (TiO2) 0.005-1.5 weight percent, zirconium oxide (Zr2O) 0-0.5 weight percent, cerium oxide (CeO2) 0-3 weight percent, and fluorine (F) 0-0.6 weight percent. The solarization-stabilized silicate glass further comprises fining agents, in weight percent on oxide basis, of: sodium chloride (NaCl) 0-2 weight percent, arsenic trioxide (As2O3) 0-0.02 weight percent, and antimony trioxide (Sb2O3) 0-1 weight percent. The solarization-stabilized silicate glass of the second optical component is at least substantially free of polyvalent components. The solarization-stabilized silicate glass of the second optical component is free of polyvalent components. The solarization-stabilized silicate glass comprises each of iron oxide, cobalt oxide, chromium oxide, copper oxide, and manganese oxide at less than 4 parts-per-million. The solarization-stabilized silicate glass comprises each of iron oxide, cobalt oxide, chromium oxide, copper oxide, and manganese oxide at less than 3 parts-per-million. The solarization-stabilized silicate glass comprises each of iron oxide, cobalt oxide, chromium oxide, copper oxide, and manganese oxide at less than 2 parts-per-million. The solarization-stabilized silicate glass further comprises, in weight percent on oxide basis: lithium oxide (Li2O) 0-2 weight percent, lead oxide (PbO) 0-2 weight percent, tin oxide (SnO2) 0-1 weight percent, tungsten trioxide (WO3) 0-0.5 weight percent, and bismuth oxide (Bi2O3) 0-0.5 weight percent. The second optical element is a lightpipe that guides light bundled by the first optical element on a light input side of the lightpipe to a light output side of the lightpipe. The lightpipe is a rod having square cross section or a plate. The light output side of the lightpipe has a cross section with a minimum lateral dimension and where the lightpipe is at least 1.5 times as long as the minimum lateral dimension. The lightpipe is at least 2.5 times as long as the minimum lateral dimension. The solarization-stabilized silicate glass comprises a lead silicate glass that comprises, in weight percent on oxide basis: SiO2 31-55 weight percent, PbO 15-65 weight percent, Al2O3 0-8 weight percent, Na2O 0.1-9 weight percent, K2O 1-13 weight percent, BaO 0-17 weight percent zinc oxide (ZnO) 0-11 weight percent, As2O3 0-0.2 weight percent, and Sb2O3 0-1 weight percent. The solarization-stabilized silicate glass comprises, in weight percent on oxide basis: SiO2 65-75 weight percent, B2O3 0-3 weight percent, Al2O3 0-7weight percent, Na2O 5-16 weight percent, K2O 0.5-12 weight percent, MgO 0-7 weight percent, CaO 2-10 weight percent, BaO 0.5-7 weight percent, ZnO 0.5-7 weight percent, TiO2 0-1.5 weight percent, As2O3 0-0.2 weight percent, and Sb2O3 0-1 weight percent. The second optical element is a pressed glass part. It further comprises a heating device to heat the silicate glass to a temperature of at least 100 degrees C. The at least one solar cell comprises a triple solar cell. The solarization-stabilized silicate glass has a relaxation time of the solarization of less than 6 hours at a temperature in a range of 200 degrees C to 400 degrees C. The solarization-stabilized silicate glass is configured so that UV light induces a density of defects of less than 3x1018 cm-3.