A teacher of mine once told me, "If you really want to help someone on their spiritual journey, shine your light on their path, not in their eyes."
"Brilliance" can make someone stand out or help those around them find their way. One is an ego trip, the other is about service.
Anyone who has encountered a genuine "beamer" knows that just being with them can be transformational. It's not what they say, even what they do that inspires so much as who they are. Who they are permeates everything they think, say and do; it creates a field of radiant influence around them. It's tangible, and it's empowering.