Elemental Imbuement

The caster imbues a weapon that they must touch, with elemental energy. When casting this spell the caster must choose Acid, Cold, Fire, Lightning, Poison, or Thunder. Until the spell ends, the affected weapon deals an extra 2d6 damage of the chosen element until the spell ends. the weapon shed bright colored light in accordance to the chosen element, in a 10-foot radius and dim light for an additional 10 feet. 

At Higher Levels. When you cast this spell using a spell slot of 3nd level the duration last for one hour,  a 5th level spell slot the spell last for 8 hours, and when a 7th level spell slot is used the spell lasts for 24 hours.