John Gill Commentary Esther 8:16

"The Jews had light and gladness, and joy and honor." — Esther 8:16 (ASV)

And the Jews had light
Prosperity, as opposed to the darkness of adversity in which they had been, see (Isaiah 8:22Isaiah 9:1Isaiah 8:2) , or lightsomeness and cheerfulness of spirit, as explained by the two next words:

and gladness and joy ;
at the good news of their deliverance, so unexpected by them; thus light is explained by gladness, (Psalms 97:11)

and honour :
among men; from their neighbours, who before were held in contempt, as a people doomed to destruction.