Backlit Onyx Wall Diffuser and Support Mock-Up Before Fabrication

Onyx does not simply become brighter when a light box turns on. Calcite bands, thickness, repairs, supports, seams, LED pitch, diffuser distance, cavity depth, color temperature, dimming, ventilation, and room light determine whether the wall glows or shows a grid. Alex Zheng explains how to build and photograph a project mock-up using the actual slab, finish, joint, backing, and support logic. The goal is to resolve shadows and hotspots before final fabrication fixes the most expressive part of the stone.