The Rise of Karzoug
Why Light as a First Level Spell?
Because I like torches. There is something iconic about the image of an adventurer heading into a dungeon sword in one hand and torch in the other that I like. Torches are staples of fantasy dungeon crawls, but in Pathfinder they are made obsolete by magic at first level.
The players will get access to Continual Flame at 3rd level and never have to worry about torches again, but for those first two levels getting a reliable light source will be non-trivial.
By way of compromise the duration of light is increased to 2 hours/level.