Not All Light Is Equal


Light as a healing modality is becoming one of the more practical tools in longevity medicine, and most practitioners still aren't sure what to make of it. This session cuts through the noise. Elias Arjan sits down with Dr. Phil Harrington to walk through the science and clinical application of photobiomodulation (PBM), from targeted Class 4 laser therapy to whole-body treatment. They'll cover how light stimulates energy production in the mitochondria, where the evidence is strongest for tissue recovery and inflammation, and how PBM fits into day-to-day practice. Dr. Harrington is one of the world's leading authorities on Class 4 laser therapy. He has spent his career researching and refining its clinical use, helping establish PBM as a credible treatment modality across pain management, rehabilitation, and sports medicine. You'll also get a clear look at what separates clinical-grade systems from consumer red-light devices, and how Summus's Horizon laser and Laser POD show up in longevity, aesthetic, and performance settings. If you're weighing whether light belongs in your protocol, this one is for you.
Key takeaways
- How light stimulates energy production in the mitochondria
- Where the evidence is strongest — tissue recovery and inflammation
- What separates clinical-grade systems from consumer red-light devices
Last Week in Longevity
A weekly briefing on the research, breakthroughs, and conversations moving longevity forward.


