Light Elves are smaller than Dark Elves typically, though they've a number of different groups, such as the Elves of the air and their flying machines, as well as a triple-jointed mutation who are rather hedonistic. There are ice elves, though I know not if they have any relation to the ice giants of Jotunheim. There are some others though the only other ones that come to mind is the tribe that rides giant winged cats.
The Dark Elves existed before the Nine Realms, in the primordial chaos that predated the big bang. They were all but wiped out in a war thousands of years ago when they attempted to return the universe to that state using an infinity stone. Their leader was mad and his followers fanatical, for when it became obvious they were losing their war, they destroyed their own planet in an attempt to take the rest of us with them.
He survived somehow, and nearly destroyed the Nine Realms again before I was able to stop him.