Subsurface scattering is a lighting effect in which light enters a material, interacts with its internal microstructure, and exits at a different point, producing a soft, diffuse, and slightly blurred appearance. In this study, the layered deposition of PETG is understood as forming this internal microstructure. The accumulation of print layers creates a medium through which light is refracted, reflected, and redistributed beneath the surface. The first series of fixture prototyping translates the subsurface scattering studies into functional luminaires that produce a soft, diffused glow suitable for ambient and decorative illumination. Through variations in scale and material colour, the series explores how form, texture, and colour influence both the fixture’s appearance and the character of the emitted light.