AM1.5G air mass filter and 1 SUN output.
Small area of illumination (1.5 x 1.5 inch (38 x 38 mm)).
Class ABB as defined by the ASTM and IEC standards.
A calibrated reference cell consists of a readout meter and a 2 x 2 cm calibrated solar cell made of monocrystalline silicon. It reads solar simulator irradiance in sun units; one sun is equal to 1000 W/m2 at 25 °C and Airmass 1.5 Global Reference.