TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - The lower side of the lowest plate has a white diffusor and the upper side of the topmost plate has a bandpass filter. FC comprises at least two plates doped and/or coated with fluorescent dyes which absorb or emit at different wavelengths of the electromagnetic spektrum.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Dye: FC comprises at least one dye selected from terrylenetetracarboxylic acid diimides, terrylene tetracarboxylic acid monoanhydride monoimides, terryIene tetracarboxylic acid dianhydrides, terrylene dicarboxylic acid dimides, terrylene dicarboxylic acid anhydrides, condensation products of terrylene tetra- and -dicarboxylic acid anhydrides with aromatic diamines, and multiple chromophore compounds containing terrylene building blocks, jpreferably terrylene tetracarboxylic acid diimides and terrylene dicarboxylic acid imides. FC comprises at least one near infra red-emitting fluorescent dye comprising (I) in combination with at least one longer wavelength-emitting or -absorbing fluorescent dye. The fluorescent dye is especially of formula (la) or (Ib). FC comprises at least one fluorescent dye based on (I) in combination with at least one fluorescent dye selected from perylene carboxylic acid derivatives, naphthalene carboxylic acid derivatives, isoviolanthrone derivatives and violanthrone derivatives. FC comprises at least one fluorescent dye based on (I) in combination with at least one fluorescent dye selected from perylene tetracarboxylic acid diimide, perylene tetracarboxylic acid monoanhydride monoimide, perylene tetracarboxylic dianhydride, perylene dicarboxylic acid , perylene dicarboxylic acid anhydride, perylene dicarboxylic acid ester, perylene dicarboxylic acid amide, multichromophore compounds (which have perylene building blocks and contain no terrylene building blocks), naphthalene tetracarboxylic acid diimide, naphthalene dicarboxylic acid dimide, isoviolanthrone and violanthrone.For (Ia):Ba1+Ba1, Ba2+Ba2 = C(O)N(R')C(O), C(O)OC(O) or a group of formula (c), completing a 6-membered ring; or(Ba1, Ba1) = (H, H), (COOM, COOM), or one of Ba1 is R or Br, and the other is H;(Ba2, Ba2) = (COOM, COOM);R = aryloxy, arylthio, hetaryloxy or hetarylthio to which further optionally unsaturated 5-7-membered ring (whose carbon framework is optionally interrupted by one or more (T) may be fused, and where the whole ring system may be substituted by one or more groups (i)-(v) ;T = O, S, NR1, N=CR1, CO, SO and/or SO2(i) = 1-30C alkyl whose carbon chain is interrupted by one or more O, S, NR1, N=CR1, C triple bond C, CR1=CR1, CO, SO and/or SO2 and which may be substituted by one or more 1-12C alkoxy, 1-6C alkylthio, C triple bond CR1, CR1=C(R1)2, hydroxy, mercapto, halo, cyano, nitro, NR 2R3, NR2COR3, CONR2R3, SO2NR2R3, COOR2, SO3R2, aryl and/or optionally unsaturated 4-7C-cycloalkyl, whose carbon framework may be interrupted by one or more O, S, NR1, N=CR1, CR1=CR1, CO, SO and/or SO2, and where aryl- and cycloalkyl moieties may be substituted by one or more 1-18C alkyl and/or by the above substitutents for alkyl;(ii) = 3-8C cycloalkyl whose carbon framework may be interrupted by one or more T and to which further 5-7-membered ring (whose carbon framework may be interrupted by one or more T) may be fused, and where the whole ring may be substituted by one or more 1-18C alkyl, 1-12C alkoxy, 1-6C alkylthio, C triple bond CR1, CR1=C(R1)2, hydroxy, mercapto, halo, cyano, nitro, NR2R3, NR2COR3, -CONR2R3, SO2NR2R3, COOR2 and/or SO3R2;(iii) = aryl or hetaryl to which further 5-7-membered ring (whose carbon framework is optionally interrupted by one or more T) is fused, and where the entire ring system is optionally substituted by one or more 1-18C alkyl, 1-12C alkoxy, 1-6C alkylthio, C triple bond CR1, CR1=C(R1)2, hydroxy, mercapto, halo, cyano, nitro, NR2R3, NR2COR3, CONR2R3, SO2NR2R3, COOR2, -SO3R2, aryl and/or hetaryl, optionally substituted by 1-18C alkyl, 1-12C alkoxy, hydroxy, mercapto, halo, cyano, nitro, NR2R3, NR2COR3, CONR2R3, SO2NR2R3, COOR2 and/or SO3R2;(iv) = U-aryl, optionally substituted by one or more substituents as for the aryl group in (iii);U = O, S, NR1, CO, SO or SO2;(v) = 1-12C alkoxy, 1-6C alkylthio, C triple bond CR1, CR1=C(R1)2, hydroxy, mercapto, halo, cyano, nitro, NR2R3, NR2COR3, CONR2R3, SO2NR2R3, COOR2 or SO3R2;R1 = hydrogen or 1-18C alkyl;R2, R3 = hydrogen; 1-18C alkyl whose carbon chain is optionally interrupted by O, S, CO, SO and/or SO2 and is optionally substituted by 1-12C alkoxy, 1-6C alkyithio, hydroxy, mercapto, halo, cyano, nitro and/or COOR1; aryl or hetaryl to which further optionally saturated 5-7-membered ring (whose carbon frame work is optionally interrupted by one or more O, S, CO and/or SO2) may be fused and where the entire ring system is optionally substituted by one or more 1-12C alkyl and/or the substituents indicated above for alkyl;R' = 4-30C alkyl (whose carbon chain is optionally interrupted by one or more O, S, NR1, N=CR1, C triple bond C, CR1=CR1, CO, SO and/or SO2) and is optionally substituted by one or more (ii)-(v); 3-8C cycloalkyl, to which optionally saturated 5- 7-membered ring (whose carbon atom frame work is optionally interrupted by one or more O, S, NR1, N=CR1, CR1=CR1, CO, SO and/or SO2), may be fused, and where the entire ring is substituted by one or more (i)-(v); aryl or hetaryl, to which further saturated or unsaturated 5-7-membered ring (whose carbon atom framework is optionally interrupted by one or more O, S, NR1, N=CR1, CR1=CR1, CO, SO and/or SO2) may be fused, where the entire ring system is optionally substituted by one or more (i)-(v); or aryl and/or hetarylazo, both optionally substituted by 1-10C alkyl, 1-6C alkoxy and/or cyano;E = 1,2-phenylene, 1,8- or 2,3-naphthylene or 2,3- or 3,4-pyridylene (all optionally substituted by 1-12C alkyl, 1-6C alkoxy, hydroxy, nitro and/or halo;M = hydrogen, alkali metal cation, (NH4)+ or (N(R2)4)+;n = 2-6, or n may be 0 when: (1) Ba1+Ba1 = Ba2+Ba2 = C(O)N(R')C(O); or (2) Ba1+Ba1 is C(O)N(R')C(O) and both Ba2 are hydrogen, or one of the two Ba2 is bromo and the other is hydrogen;z = 0-6;Hal = bromo or cyano;provided that:n + z less than or equal to 6; andz is not 0 only when Ba1+Ba1 and Ba2+Ba2 are not C(O)N(R')C(O).For (Ib):Bb1+Bb1 = C(O)N(R')C(O) or a group of formula (d) to complete a 6-membered ring; orone of Bb1 = hydrogen and the other is X;Bb2+Bb2 = C(O)N(R')C(O) when Bb1+Bb1 = C(O)N(R')C(O), or when one of Bb1 is hydrogen and the other is X and where x = 0 and n does not equal 0;Bb2+Bb2 = group (d) when Bb1+Bb1 is group (a) or (d), or when one of Bb1 is hydrogen and the other is X or R and where x =0 and n' does not equal 0;X = a group of formula (e);Y = O or S;Z = bridging group comprising one or more aryl or heteroaryl, where Y may be bound to either the aryl or heteroaryl;x = 2-6 when Bb1+Bb1 and Bb2+Bb2 = C(O)OC(O), and x = 0 for all other definitions of Bb1 and Bb2;n' = 0-8, provided that x+n' less than or equal to 8 and n' does not equal 0, when x = 0; andn1 = 0-2.All other definitions for (Ib) are as for (Ia).    TECHNOLOGY FOCUS - POLYMERS - The polymer further comprises at least one stabilizing additive selected form light- and oxidation protection agents. The polymer comprises polyacrylate or polycarbonate.