The Wall Lights mod adds a new light object that can be mounted on walls. Wall lights will allow you to gain space in all rooms instead of wasting tiles with standing lamps. These lights are meant to be placed on a tile in front of a wall and rotated in place.
The Wall Lights use 15 of power and take steel x5 to build. They put off a lot less light than the vanilla Standing Lamps, so it’s a good trade off. A standard Wall Light requires the Electricity Research, and the colored variants require the Colored Lights Research, much like a Standing Lamp.
If you feel like the Wall Lights are not bright enough, there is a brighter version of this mod here. Since the wall lights use less power than regular standing lamps, the brighter version can be considered… cheating. Use at your own discretion.