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An indoor test stand for fluorescent planar concentrator-collectors (FPC) with a 1.6-kW xenon light source, irradiating a rectangular triangle (active area 400 cm(2)) with 82 mW cm(-2), and a typical homogeneity of +/-10% is described in detail. Conditions and definitions for the efficiency measurements are discussed, taking intensity and reflection effects into account. As an illustration FPC efficiency and concentration ratios are reported (best optical efficiency was 7.5% for a single-plate one-dye FPC), the influence of thickness variation is discussed, and an enhancement in solar cell efficiency is demonstrated.

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