A lighthouse is a structure that emits a light that can be seen from a long distance away, so the simile is comparing the fact that he can sense her mind easily despite the distance as something bright and welcoming.
Context: He could pick up her mind from miles away; it was always bright and welcoming.
Hypothesis: He could pick up her mind from miles away; it was like a lighthouse beacon to him.

Given this context, is the hypothesis true (Yes/No/I don't know)?