The phrase "beacon of light" is a metaphorical expression that refers to something or someone who provides guidance, hope, and inspiration in a dark or difficult situation. Full definition
I got my first automaton from exploration, and its arrival was like a shining beacon of light in the darkness. (wolfsgamingblog.com)
It's been a long road for the Vita, and despite it becoming a small beacon of light for handheld RPG's and indie darlings, the system quickly lost traction to mobile gaming and Nintendo's 3DS. (gameplanet.com.au)