Abstract
The interplays between design and material parameters in a cylindrical mirror light pipe are discussed. The transmission is calculated exactly using a ray optics method. The result is an integral equation involving the mirror light pipe parameters, reflectivity and aspect ratio, and the angle of incidence of the incident radiation. The calculations of transmission are found to be in good agreement with experimental results. The specular reflectivity is the key parameter so that the wall material determines colour rendering properties of the transmitted light.
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