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## Main Question or Discussion Point

Hi,

When you measure irradiance using a spectroradiometer, can you calculate radiance based on the irradiance outputs? How does one measure the angle in cosθ and solid angle Ω in the radiance formula?

Thanks!

When you measure irradiance using a spectroradiometer, can you calculate radiance based on the irradiance outputs? How does one measure the angle in cosθ and solid angle Ω in the radiance formula?

Thanks!