瑜伽論記 9.326

9.326

同類往趣中，梵光益天者，基云：以在大梵天光故名梵光天，云何名益？今云在大梵前而作饒益，故云梵光益天，亦名梵前益天。

Under "going to assemblies of the same kind," regarding "the devas who benefit through Brahma's light": Ji says: Because they are in the light of the Great Brahma, they are called the Devas of Brahma's Light. Why are they called "benefiting"? Now it is said that they produce benefit in front of the Great Brahma; hence they are called the Devas Who Benefit Through Brahma's Light, and also called the Devas Who Benefit in Front of Brahma.