Sumlink is a dedicated Human Centric Lighting brand. We believe light has always been more than illumination — it shapes how people feel, focus, and recover.
Traditional specification stops at lux levels and CRI. SUMLINK goes further — mapping the full spectral arc of a space's operating hours against human physiology. Every program we deploy is built on a time-spectrum framework: quantifying M/P ratio transitions, flicker compliance (SVM), and melanopic dosimetry across the operational day, aligned with CIE S 026.
We work with internal photosensitive retinal ganglion cells (ipRGCs) as our design constraint, not as a marketing phrase. The result is lighting that performs — visually, biologically, and commercially — across the full arc of your space's operating hours.
One database. Two entrances — depending on whether you are specifying components or deploying a complete environment.
Our Catalog leads with the parameters that actually predict HCL outcomes — M/P Ratio, SVM, Δu’v’, CCT Tuning Range — alongside the standard photometric and electrical fields and full IES files, downloadable without registration. Your BOM, your timeline, without a sales call. Where a supplier does not report the human-factor figures, SUMLINK Verified marks the batches we have measured against IES LM-79 and CIE S 026 ourselves.
Our Lighting Programs are complete light environments — each one a specified illuminance-and-M/P arc from opening to close, a configuration file for Casambi, Matter/Thread or DALI-2, and a BOM ready for the control panel. From the page to the control system without a redesign.
Sumlink was born not from a legacy lighting business, but from a persistent question: if light is meant to change like sunrise and sunset, why do we still accept static artificial light? That question led us straight into Human Centric Lighting. Having no legacy baggage allowed us to start purely from the relationship between people and light, rethinking what a luminaire should be. We bring together dynamic spectrum technology, high-precision optics and intelligent controls, turning complex systems into simple, reliable products. We have no manufacturing legacy to protect. That means every decision comes down to one thing: biological value in every beam. Every product is designed from day one to the HCL standard — not retrofitted to it later.
In-House Spectral Design — Spectrum definition and smart dimming logic developed by our own team, not off-the-shelf generic modules · Rigorous Quality Control — Full inspection covering colour temperature consistency, lumen output and power stability
If lighting designed around people matters to you, let's talk.