I think it might just be lighter because of all the ware it receives. It's a really popular tourist destination and receives over a hundred thousand visits every year.
I always thought when looking at pictures of this place that the ldistance of the fjord was just a trick of the landscape, that the fjord actually got smaller and that it wasn't as big as it looks... but I went down the other side, and it only gets bigger. Like, twice as high as Preikestolen. It's truly an incredible place. I think that amount of open space between two mountains makes it more prone to catching light conditions like this, because you see it in lots of the photos. Truly a phenomenal place