This is material based fake light so it's much cheaper to render and handle by the engine compared to real light sources.
Would work perfectly for your Fortnightmare maps!
Of course it has limitations, such as no shadows and will "bleed" light through the wall if you place it overlapping on both sides.
What it allows to do:

• Can work as point (spherical) and box light.
• Can set color.
• Can set light edge softness and intensity.
• Can control flicker to imitate fire or broken light bulb.
• Can use image with different projection ways: planar top or side, radial from source center and cubemap.
• With texture can make projector look.
• Just need to apply to inverted sphere or cube mesh (included in files) and drop them into level where you need light to be and scale.

Please note that one of the limitations is that you can't too much overlap meshes with this fake light or in overlapping areas it may start glow too much! So space them properly.

In few days I will release video tutorial as well. But if you don't want to wait or you want to support us you can buy it here!