HEALD Li‑Fi/VLC v1.1: Safety-Gated Nine-Emitter LED Optical Wireless Architecture and Robust Candidate 5093

HEALD Li‑Fi/VLC v1.1 presents a rigorously tested computational engineering architecture for transmitting high-capacity indoor wireless data through modulated diffuse LED illumination. The selected architecture, Candidate 5093, uses nine diffuse LED ceiling emitters arranged as a distributed 3 × 3 optical wireless array across a modeled 5 m × 5 m room with a 2.7 m ceiling. Candidate 5093 is designed to transfer high-capacity indoor wireless traffic from radio frequencies to diffuse visible light. Widespread deployment could reduce the number, transmit duty cycle, and required power of indoor Wi‑Fi access points while providing fast, room-contained optical connectivity. This architecture has meaningful physical importance because it transforms the general idea of LED-based optical communication into a specific, quantified, reproducible, and tolerance-tested engineering target. The results define the proposed array geometry, total optical power, beam spread, modulation characteristics, receiver behavior, illumination distribution, room coverage, data-rate potential, efficiency requirements, and expected operating margins needed to guide physical prototype construction and laboratory evaluation. These results were not concluded from a single calculation or a preselected favorable outcome. The master sweep evaluated 25,000 independently generated candidate configurations against mandatory modeled irradiance, blue-weighted screening, maximum-illuminance, flicker, coverage, edge-data-rate, and electrical-to-optical efficiency gates. A total of 4,404 candidates satisfied every nominal computational requirement. Twenty leading finalists then underwent 20,000 expanded Monte Carlo uncertainty trials each, producing 400,000 finalist-level robustness trials. Every trial retested the complete gate structure while simultaneously varying optical output, beam geometry, electrical-to-optical efficiency, optical efficacy, receiver responsivity, receiver noise, modulation depth, modulation bandwidth, flicker behavior, observer distance, and blue spectral-power proxy. Candidate 5093 achieved a 99.875% modeled probability of satisfying the complete expanded gate set. Its nominal estimated edge rate was 2,664.30 Mbps, its fifth-percentile Monte Carlo edge-rate estimate was 2,401.45 Mbps, and its fifth-percentile modeled room coverage was 95.8478%. These results matter to the physical world because indoor wireless demand continues to increase while conventional radio-frequency networks must divide limited spectrum among many devices and neighboring rooms. Diffuse LED Li‑Fi offers a physically different communication pathway: ordinary-looking room illumination can become a high-capacity data-delivery layer, while walls naturally contain much of the optical signal. This could improve spatial reuse, reduce radio-frequency congestion, provide room-specific optical connectivity, and lower reliance on continuously transmitting indoor Wi‑Fi access points. The release preserves the exact executable source, fixed random seed, complete candidate population, finalist results, expanded Monte Carlo summaries, corrected nine-emitter room maps, visualizations, professional concept cover, reproducibility instructions, and SHA-256 integrity records. The computational record establishes a highly developed physical engineering target. Physical construction and instrumented experimentation can now test how closely the completed LED system aligns with these rigorously established predictions. THE COMPUTATIONAL RECORD ESTABLISHES THE TARGET. PHYSICAL EXPERIMENTATION TESTS ITS ALIGNMENT.