Matt Maruca - Circadian Light Masterclass: Debunking Sunglasses & Blue-Light Hysteria

Origin story: how a teenager's blue-blocking glasses became a business

Luke recalls meeting Matt Maruca at 18, who pitched himself as a guest by explaining circadian biology clearly. Matt custom-tinted Luke's first pair of blue-blocking glasses, which launched what became his eyewear company Gilded.

"Oh man, these would be sick if they were blue blockers. And those ones that you made for me, I wore for years."

Good blue vs. bad blue: the 450nm cutoff that changes everything

Blue light below 450nm damages retinas and skin with no biological upside. Blue above 450nm regulates circadian rhythm but only benefits you during daytime. Indoor LED lighting blasts both, spiking cortisol when you're sedentary and lacking the protective near-infrared that sunlight provides.

"Well, it looks more and more like it's not sitting that's so bad, but it's sitting under artificial lights, which jack up our cortisol levels, make us more stressed when we're not actually using all that sugar. So just being under blue light, and Dr. Jack Cruz and others have spoken about this, increases blood sugar because it's increasing cortisol. That's good if you're out doing stuff. You need that if you're moving. But if you're sitting around, it's like pushing against a closed system."

Morning sunlight preps cells to handle midday UV without burning

Early sunrise exposure builds structured water in cells, boosts mitochondrial melatonin, and kickstarts the cortisol rhythm -- all of which precondition the body for stronger midday sun. Skipping sunrise and jumping straight into intense sun is a recipe for oxidative damage.

"Also, they're helping the mitochondria to basically make energy and kind of be more resilient and have more melatonin as well. There's also the benefits of getting this cortisol rhythm going, which is, as I mentioned earlier, So I would say it seems quite clear, based on my understanding and the evidence that there is, that getting morning sunlight, early morning sunlight is going to help to make your system more prepared and sort of preconditioned for midday and later sun exposure versus like staying out late, drinking, which is also an issue. Of course, dehydrates your body and whatnot. That's what a lot of people do when they're in the tropics, you know, having."

5 problems with modern LEDs: no near-infrared, bad blue, flicker, poor spectrum

Modern indoor LEDs fail in 5 ways -- zero near-infrared (40% of sunlight), excess damaging short-wavelength blue, overstimulating hormonal blue, poor color rendering (CRI 80 vs 100 for sunlight), and constant flicker. Their new incandescent-replica LED bulb addresses all five issues.

"They're sort of the reference. Modern LEDs have accepted a CRI of 80 as good enough, as good enough. And that's why most people have a really serious issue with self-confidence because they see themselves constantly under these terrible LED lights, which make you look pale, sick. They're overhead, so the shadows on your face look terrible. If anybody's ever gone into a bathroom where they actually have a You see yourself as healthier and more alive."

Why all-red lighting isn't the answer: dim deep blue is actually calming

The biohacker instinct to go all-red at night is wrong -- monochrome red has no color rendering and can be stimulating at high intensity. Their LED bulb follows a blackbody curve with adjustable color temp from 2700K down to 1200K. Paradoxically, deep saturated blue at low intensity is calming because it mimics dusk.

"So, the only, this is just my theory. I don't know if you've ever thought of this yourself, but the only time in nature through our evolution, we ever would have been, had a light flicker on and off is if we were chasing game through a forest or running away from something trying to kill us. Think about like if you run on a trail, it's like it flickers. I mean, not like a shitty light bulb."