In this paper, we report on the efficient design of a light-emitting diode (LED)-based AAA class solar simulator, employing only 19 high-power emitters for a usable illuminated area of at least 5 cm in diameter with at least 1 sun irradiance. Such a low number of emitters was achieved by selectively employing secondary optics for several LED groups and taking advantage of wide emission angle for others. The so-called A class spectrum was also achieved for the larger area of more than 6 cm × 6 cm, covering zones with B and C class irradiance nonuniformity. Five distinct solar cell external quantum efficiency spectra were considered for theoretical evaluation of possible measurement peculiarities related to different solar cell technologies. These computer-generated spectra contained essential features, which is typical for highefficiency crystalline and amorphous silicon, Cu(In,Ga)Se 2 , and Cu 2 ZnSn(S,Se) 4 solar cell technologies. Significant photocurrent distribution nonuniformity change is predicted only for amorphous silicon cells due to a much narrower efficient absorption spectrum.

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High-power light-emitting diodes for application in a solar simulator were evaluated. The solar simulator was designed using only 6 types of high-power LEDs. The irradiance non-uniformity of this simulator was investigated and it was demonstrated that a small array (only 25 units) of selected light-emitting diodes can provide sufficient irradiance to achieve AM1.5G requirements for the test area of at least several cm in diameter without any secondary optics.

High-power light-emitting diodes for application in a solar simulator were evaluated. The solar simulator was designed using only 6 types of high-power LEDs. The irradiance non-uniformity of this simulator was investigated and it was demonstrated that a small array (only 25 units) of selected light-emitting diodes can provide sufficient irradiance to achieve AM1.5G requirements for the test area of at least several cm in diameter without any secondary optics.