umbra viventis lucis -> shadow of the living light, reflection of the living light

[spiros]

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umbra viventis lucis -> reflection of the living Light

From early childhood, long before she undertook her public mission or even her monastic vows, Hildegard's spiritual awareness was grounded in what she called the umbra viventis lucis, the reflection of the living Light.
https://en.wikipedia.org/wiki/Hildegard_of_Bingen

[billberg23]

Literally, umbra means not reflection, but "shade" or "cover," as if a luminous cloud were covering the "sun" of her ecstasy:
The brightness [lumen] that I see is not spatial, yet is far, far more lucent than a cloud that envelops the sun. I cannot contemplate height or length or breadth in it; and I call it “the shadow of the Living Light” [umbra viventis lucis]. And as sun, moon and stars appear [mirrored] in water, so Scriptures, discourses, virtues, and some works of men take form for me and are reflected, radiant in this brightness.  http://www.hildegard-society.org/2015/02/

[spiros]

Yes, of course, Italian ombra, French ombre.