The 16S is a ready-to-use photovoltaic test light source. The 16S-300-002 has a full spectrum "A" class spectral output (AM1.5). The 16S-002 comes with a vertical beam adapter that redirects the beam vertically downward. Typical spot size is 2.25 inches, 1 sun output intensity. Customizable spot size. By adjusting the knob on the power supply, the output light intensity can be adjusted from 0% to 100%. With the attenuation tool kit provided by Solar Light, the light intensity can be adjusted from 10% to 100%. 16S accurately reproduces the full solar spectrum. It complies with the latest ASTM light source standards. Many ASTM standards that require G151 and G155 standards can be achieved by 16S-002. 16S