I am referring to his 1997 version when I say that Hoth is very white.
Here is a quick comparison between the 1997 and Revisited versions:
https://imgur.com/a/O9HEvx1
There was a long debate somewhere in this forum a few years ago regarding how white/blue Hoth was when seen in the cinema in 1980. If I recall correctly, the consensus was that there was actually a blue tint, albeit not as much as on the official Blu-ray.