| http://www.w3.org/ns/prov#value | - The various embodiments of the light units, particularly the embodiments according to FIGS. 1 and 2 and 7 through 9, form component parts of a system of light units that comprises light units for differently dimensioned and, accordingly, fluorescent bulbs that have different lengths, whereby all prism plates employed in this system, i.e. the prism plates 22 and 28 and the prism plates of the pairs
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