Burning Weapon

You touch a piece of ammunition or weapon, imbuing it with magic flames. The first time you attack with the empowered item, it bursts into brilliant flames. On a hit, the target takes an additional 4d4 fire damage and begins to burn. On a miss, the target takes half as much damage and does not start to burn.

The burning target sheds bright light in a 10-foot radius and dim light for an additional 10 feet and takes 1d4 fire damage at the end of its turns unless a creature uses their action to put the flames out.

Once an attack has been made with the piece of ammunition or weapon, the spell ends. If you touch a weapon with the Light property, you can immediately make a single weapon attack with it as part of the same action casting the spell.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, both the initial and ongoing burn damage are increased by 1d4 damage.

Source: Kibble's Casting Compendium