| http://www.w3.org/ns/prov#value | - A light source according to claim 7, wherein said at least two planar light source sections are divided into two groups, further including means for retrieving electric power of the electron emitters in one of the groups with the electron emitters in the other group when the electron emitters in said one group emit light, and retrieving electric power of the electron emitters in said other group w
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