Our simulators are available with several beam sizes. The magnitude (sun value, total irradiance in W m-2 or spectral irradiance at any wavelength in W m-2 nm-1), but not the shape of the spectral curve, depends on the beam size. That is, the shape of the curve of any Oriel Solar Simulator with the same Air Mass filters is essentially the same.
The 91192 kW (4 x 4 inch) Solar Simulator, with AM 0 filter has a typical integrated irradiance of 3575 W m-2 compared with the "1 sun" value of 1367 W m-2 of the AM 0 standard. The 91191 (2 x 2 inch) Simulator, with the same AM 0 filter, has a typical integrated irradiance of 13400 W m-2.
You can reduce the magnitude of the simulator output by 15% using the power supply controls, and by more than 80% by adjusting lamp position and using optional apertures. Using apertures improves the output beam collimation.
The xenon lamp spectrum differs from all solar spectra because of the intense line output in the 800 - 1100 nm region. We use our AM 0 filter to reduce the mismatch, but no reasonably economical filter can remove the line structure without severe modification of the remainder of the spectrum. The relevance of the residual infrared mismatch depends on the application. Our AM 1, AM 1.5 and AM 2 filters also modify the visible and ultraviolet portion of the spectrum for a better match to the standard solar spectra. Many photobiological and photovoltaic applications require very close simulation of the solar ultraviolet. For PV cell testing, we offer Oriel Sol3A Class AAA Solar Simulators, which use a proprietary filter to minimize the mismatch.
It is helpful to consider the solar spectral and simulator curves as having both a shape and magnitude. The easiest single number specifying the magnitude is the total irradiance, the integral of the curve.