| http://www.w3.org/ns/prov#value | - Generally, from the point of view of balance between incidence or transmission efficiency of incident light from each of the light sources and reduction in thickness and weight of the cell substrate as a transmission substrate, the thickness of the cell substrate is preferably selected to be in a range of from 10 ??m to 5 mm, particularly in a range of from 50 ??m to 2 mm, more particularly in a r
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