"iridescent light" refers to light that appears to change colors when viewed from different angles. It creates a shimmering or rainbow-like effect. Full definition
My favorite details were the mint julep cups in the room — such a unique «Kentucky - esq» welcome and my favorite art in the hotel was a frame full of iridescent lights that changed colors. (lc-steele.com)
It is encrusted with sparkling rhinestones of various shapes and sizes (Blue Montana) that cast iridescent lights. (tissura.com)
While my tinsel tree lacks the vintage charm of an antique version, with lights and ornaments, it shimmers with undeniable iridescent light. (deeplysouthernhome.com)