| http://www.w3.org/ns/prov#value | - In addition, by positioning the output portion 130 of the light source 126 inside of the tube 106, additional optical focusing elements, such as lenses or mirrors, may not be required; moreover, the geometry of the tube can be optimized, such that light conduction is optimized by for example, creating surfaces within the tube designed to reflect light through and along the tube to transport the li
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