Our lights are built to support how your body naturally works – using proven science and over 500 patents. By delivering the right kind of light at the right time, we help your body restore its rhythm – so you can sleep better, think clearer, and feel more balanced.
Humans Evolved Under Natural Light
For thousands of years, the sun was our only guide — its rising light sparked energy, and its fading glow
signaled rest. Today, artificial light surrounds us, but our internal clock still relies on the sun’s natural
signals to stay in sync.
Key biological pathways affected by light:
ipRGCs: Light-sensitive eye cells that tell your brain what time it is.
SCN: The brain’s master clock that sets your body’s daily rhythm.
Pineal Gland: Uses timing signals to control melatonin and your sleep–wake cycle.
How light controls your body’s clock
When light enters your eye, it does more than help you see. Special sensors in the eye send that light straight to the brain, where it controls your internal clock – also called your circadian rhythm. That rhythm tells your body when to be alert, when to sleep, and when to heal.
Here’s how it works:
Retinal ganglion cells – These are light sensors in your eyes that don’t help you see. Instead, they act like messengers. When they detect light – especially blue light – they send signals to the brain that say, “It’s daytime!”
SCN: The SCN (suprachiasmatic nucleus) – This is your body’s master clock. It sits deep in your brain and gets those messages from your eyes. It uses them to keep everything on schedule: your sleep, your hunger, your energy, even your mood.
The pineal gland and melatonin – In the evening, your brain makes melatonin, a hormone that helps you sleep. The SCN tells the pineal gland when to start and stop melatonin. But this only works right when your body knows it’s dark.
Output rhythms – These are all the things your body does on a daily cycle. They include how well you sleep, how hungry you feel, how your cells repair themselves, and how focused you are. When your internal clock is aligned with natural light, all of these rhythms work better.
Why artificial light throws us off
The artificial light we’ve been using isn’t like sunlight. During the day, it’s too weak to fully wake up our brain. At night, it’s too strong to let our brain wind down. This confuses the light sensors in your eyes, sending the wrong signals to your internal clock. As a result, your sleep, mood, focus, and metabolism all start to drift off track.
When we stay in this off-rhythm state – too alert at night, not alert enough during the day – our health pays the price. Science has linked this disruption to poor sleep, higher stress, weight gain, and even long-term disease. Light is not just for seeing. It’s a signal.
We’ve Moved Indoors. But Our Biology Hasn’t.
We spend nearly all our lives indoors, cut off from the sun’s natural signals. Artificial light stays the same all day, it confuses our brain and misguides our biology.
Korrus uses patented spectral engineering to restore the natural cues missing from indoor light. Our circadian technology automatically shifts light across the day to align with your biology, helping regulate sleep, energy, and cellular repair.
When Light Disrupts Your Clock, Everything Suffers
The harm to our health is not theoretical; it’s backed by decades of circadian science.
Image Credit: SatchinPanda, Professor at the Salk Institute and Center for Circadian Biology at UC San Diego
We Don’t Need Better Workarounds. We Need a Better Light.
Blue Blockers Fall Short
They filter light, but the wrong signals still reach your brain.
Sleep Without Rhythm
Pills force rest, but they don’t repair your body’s internal clock.
Track What Matters
Real recovery starts with light that keeps your body in sync.
Melatonin: The Body’s Night Shift Powerhouse
Melatonin does much more than help you sleep. It’s a master signal for your entire evening biology. When light
fades, melatonin tells your body it’s time to rest, repair, and protect. But most of us are unknowingly blocking
this natural evening process — just by turning on the lights.
Two light sources. One big difference.
One group was exposed to circadian light (Korrus Bulb). The control group was exposed to standard LEDs.
The result?
68% more melatonin was produced earlier in the evening, which equates to better sleep and feeling well rested in
the morning.
Melatonin: More Than Sleep
Melatonin isn’t just a sleep hormone — it’s a powerful antioxidant your body makes naturally. But to produce it,
your biology depends on precise light signals throughout the day and evening. Without them, melatonin production
stalls, and your body misses critical recovery time.
Key Points:
Melatonin supports cell repair, immune function, and reduced disease risk — including cancer.
It starts with tryptophan, an amino acid from food, which converts to serotonin with help from morning blue light.
Darkness is essential in the evening to turn serotonin into melatonin. Standard LEDs disrupt the process — too dim by day, too bright at night.
Even small amounts of light in the evening can delay melatonin and shorten restorative sleep.
Natural melatonin outperforms supplements — but only when your light signals are aligned.
Our Technology:
Built to support your biology with bright, blue-rich light in the morning and blue-free light at night — exactly
when your body needs it.
Most white LED bulbs use strong blue light around 450 nanometers. That’s the kind of light that signals your biology that it’s daytime. Even bulbs that look warm can have this hidden blue spike, which can block melatonin in the evening and confuse your body’s rhythm unless the light is filtered or dimmed way down.
What is circadian lighting?
Circadian lighting changes throughout the day to match how your body naturally works. In the morning and daytime, it includes more blue light to help you feel awake and alert. After sunset, it removes that blue light so your body can start getting ready for sleep. It still keeps a soft touch of violet light so the room feels gentle and calm, while your body makes melatonin – the hormone that helps you fall asleep.
How does light affect my biological clock?
Your eyes have special cells that can sense blue light. This kind of light helps you wake up in the morning by boosting your focus and telling your body to make more cortisol – the hormone that helps you feel alert. But if you see blue light at night, it can block melatonin, the hormone that helps you sleep. That’s why the timing and color of light are both important for keeping your body on a healthy daily rhythm.
What are circadian rhythms, and why do they matter?
Your body runs on a 24-hour clock called a circadian rhythm. It helps you know when to wake up, go to sleep, and stay healthy. There’s a tiny part of your brain that acts like your body’s timekeeper. It needs blue light in the morning to stay on schedule. When your rhythm is in sync, you feel awake during the day and sleepy at night. But if it gets off track, it can make you tired, moody, or even affect your health.
What type of light disrupts sleep the most?
Blue light (between 440 and 495 nanometers) is the one that gets in the way of melatonin production – the hormone that helps you sleep. Even a small amount of blue light at night can fool your body into thinking it’s still daytime. That makes it harder to feel sleepy. But violet light (around 420 nanometers) doesn’t get in the way of melatonin as much, especially if your eyes have already been in light for about 30 minutes.
Is blue light always bad for me?
Not during the day. Blue light is great for you in the morning and through twilight hours as it helps you feel awake, think clearly, and keep your body clock running on time. But at night, blue light can block melatonin – the hormone that helps you sleep. So it’s helpful in the morning, but it gets in the way in the evening.
