| http://www.w3.org/ns/prov#value | - From this point of view, the light pipe is preferably provided as a light pipe having prism-like irregularities in which the projected area of the long side surfaces on the reference plane of the lower surface is not smaller than 8 times, particularly not smaller than 10 times, more particularly not smaller than 15 times as large as that of the short side surfaces.
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