The performance of a solar simulator is evaluated using three key parameters: spectral match, spatial uniformity, and temporal stability.
Spectral match describes how closely the emitted light spectrum of the simulator reproduces the reference solar spectrum.
Spatial uniformity indicates how evenly the irradiance is distributed across the illuminated test area.
Temporal stability refers to the stability of irradiance over time during operation.
These three parameters determine the overall quality of a solar simulator and are defined in international standards such as IEC 60904-9 and ASTM E927.