Full show notes: http://bengreenfieldlife.com/bluelighttruth Light is one of the most powerful environmental signals your body responds to, yet it’s also one of the easiest to get wrong. Used correctly, it can support energy, focus, sleep, and hormonal balance. In this episode, repeat guest Matt Maruca, founder and CEO of Ra Optics, covers what actually matters when it comes to blue light, circadian rhythm, and how your eyes and brain interpret different wavelengths throughout the day. - We get into why early-morning sunlight and evening light exposure play completely different biological roles, how your circadian rhythm evolved to prepare you for daytime stress, and why the idea that “all blue light is bad” falls apart when you look at the underlying physiology. - Matt compares the difference between clear lenses that barely block anything and true blue-blocking lenses that reliably preserve melatonin, support nighttime wind-down, and still allow circadian-friendly light to reach the brain. We even run real-time spectrometer testing to show exactly which wavelengths different lenses block and which ones they don’t. - We also discuss newer lens technologies designed to amplify beneficial blue light in the morning, reduce damaging wavelengths later in the day, and support alertness without overstimulation. This episode is for anyone who wants to understand how light actually shapes sleep, energy, and performance—and how to make smarter decisions about the environments you live and work in. 🧑‍🧑‍🧒‍🧒Check out my FREE Top Health Community! - https://joinlifenetwork.com 💊Shop My Curated Marketplace of Vetted Products! - https://shoplifemarket.com 🏋Sign up for a FREE Coaching Call! - https://jointriumphcoaching.com 📩 Check out my FREE newsletter! - https://bengreenfieldlife.com/newsletter/ Last week's article: https://bengreenfieldlife.com/article/newsletter-6/ This week's article: https://bengreenfieldlife.com/article/newsletter-7/ 🔗My Website: https://bengreenfieldlife.com/ 🔗My Podcast: https://bengreenfieldlife.com/podcast/ 🔗My Books: https://shopbengreenfieldlife.com/collections/books Connect with me: ⬇️ Instagram https://www.instagram.com/bengreenfieldfitness/ Facebook https://www.facebook.com/BGFitness X https://twitter.com/bengreenfield TikTok https://www.tiktok.com/@bengreenfield 00:00 Relaxing Glasses Collaboration 06:16 "Solar Callus and Sunlight Prep" 11:24 "Good vs. Bad Blue Light" 19:48 Confirmation Bias in Sleep Studies 22:44 Starting a Glasses Company Reluctantly 29:35 "Critique of Blue Light Glasses" 33:20 Clear Blue Light Lenses Scam 37:30 "Blue Light Glasses for Alertness" 43:48 "Blue Light and Circadian Rhythm" 52:57 "Color Rendering and Light Perception" 54:13 "Good Blue Circadian Lighting" 01:00:42 Transparent Affiliate Disclosure