Dim

As an action, you hold up a square of black fabric and create a  cube (up to 10 feet side) of light-obscuring shadowy illusions, causing bright light to become dim light within the cube, or dim light to become darkness. If this spell is cast over a light source like a torch, candle, glow-stone or campfire the light source ceases to cast any light outside the cube. The casting of Light, Dancing Lights or any spell using a spell slot to create a light source cast or targeted within the cube immediately dispels the cube's effect.

At 5th level you can expand the size of the cube to 15 feet, at 11th level you can expand the size to 30 feet and at 17th level you can expand the cube up to 60 feet on each side.