For example here is link to a Xenon lamp solar spectra simulator Xenon lamp AAA Class Solar Simulator.
Two spectra are shown in the plot given in the link, one for the AM1.5G reference an other of the solar spectra simulator itself. If one needs to test e.g. an image sensor or a photo-diode signal produced from sunlight in 800 – 1100 nm range what is the benefit of using a solar simulator, since spectra in that band (800 -1000 nm) does not resemble the sunlight spectra at all. Actually it looks like a complete mess after 700 nm, and far from a good fit to the real solar spectra or AM1.5G.
Since other solar simulators I have looked up have a similar spectrum I don’t understand how are they used ? Are they used for testing photo-diodes and image sensors, that is to simulate the signals produced by the certain sunlight spectral bands at all, or I am missing the purpose of solar simulators ?