For spectral measurement of the three irradiance components(DNI，GHI，DHI)we took a different approach. A spectroradiometer with rotating Shadow Band(RSB) is an attractive to a conventional 3 component sun tracker system. Just one spectroradiometer used for all measurements lowers the costs associated with the instrumentation required. Accurate DNI measurements can be obtained from a MS-711 Global spectroradiometer with RSB comparint with the MS-711 DNI spectroradiometer on a sun-tracker. The comparison between the outputs spectral DNI from the two configurations reveals a consistency in the method and the measurements of all 3 irradiance components. EKO will provide the RSB solution for all spectroradiometer models.

光谱辐照度是每年单位频率或波长表面的辐照度。波长光谱的光谱辐照度是以瓦特每平方米每纳米测量的。（W·m^-2· nm^-1)

光谱辐射计是用来测量光源光谱分辨率分布的装置。根据光谱功率分布，可以确定光的辐射、光度和比色量，以便测量、表征和校准各种应用的光源。

光谱辐射计通常测量光谱辐照度和光谱辐射。光谱辐射计系统不需要连接到个电脑就可以工作。这使得它们在保持光谱仪精度的同时具有高度的便携性。