| http://www.w3.org/ns/prov#value | - The length of each individual module 209 and optic 210 is not arbitrary, however, in that one must take into account the differential thermal expansion between the material of the housing, which needs to be a good thermal conductor such as aluminum or other similar materials, and that of the optics, which should be made out of a highly transparent molded material such as acrylic, polycarbonate, or
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