It is correct, but I never think of terms of appositive or parenthetical elements when positing commas in such sentences. The sentence seems to have a natural caesura , between 'light' and 'its', and the sentence therefore seems to me to demand the insertion of a comma there. I'm afraid I'll have to leave it to others, more conversant with the technicalities of English grammar, to explain why the first comma is needed in the sentence.
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