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A flower pattern that seems to glow from within, probably related to plicata genetically, characterized by absence of anthyocyanin coloring in the hafts and heart of the flower. Many times it has the look of "rays" (which is actually it's veinging) on the falls coming from the heart.
Another definition of a luminata as it pertains to iris is this:
A luminata has a wash of color in falls over paler veining with clear unmarked area on hafts around the beard; paler edge on the petals usually with the same color as the hafts and veining.
See here another example of a luminata - - in Tall Bearded iris.