For the celestial body of the same name, see Sun.
Sun is a suffix that can appear on Magic and Rare Items. It provides a large bonus to both Light Radius and Attack Rating.
It doesn't start spawning on items until Item Level 17.
The base Light Radius is 13. The Max Light Radius you can have is 18 so anything more than net +5 to Light Radius will not matter.
Stats[]
Sun
+5 to Light Radius, +5% Bonus To Attack Rating
Can appear on: Magic Items, Rare Items
Is available on: Amulets, Bows, Crossbows, Gloves, Helms, Rings, Scepters, Staves, Wands