At first all the significance of having seen the light of the Two Trees seems metaphorical, that it just allured to the fact that those elves have apprenticed under the Ainur and learned a lot of stuff before the First Age (compared to their brethren who stayed in Middle Earth and played with tree houses). But the more I think about it, it seems the light might actually bestow some kind of tangible buff (enhancing people mentally or physically) to the elves that have seen it. Biggest example is Elwe/Thingol. This guy technically never apprenticed in Valinor (maybe just learned a thing or two from his wife). But the book seem to make a big deal out of the fact of him just having seen a glimpse of the Two Trees when he went as an ambassador to scout out Valinor. Am I miss reading this, or is the buff part kind of implied?