Looking all over Nexus for a simple Sun Damage Enchantment mod? Look no further 'cause here it is! After discovering EnaiSiaion's Summermyst mod, I figured this was as close as I was going to get to what I wanted unless I.......modified one myself. So the best I could do in the shortest amount of time was this.

You'll find a chest in Whiterun behind the Smith's shop along the wall. Inside you'll find 6 different Iron swords all enchanted with Sun Damage plus an extra 7th sword for disenchanting. All credit goes to EnaiSiaion, all I did was extract what I wanted. Original mod found here.