Sun-matched spectrum
Specialized LEDs closely match the visible spectrum of sunlight, rich in the 480nm wavelengths that set your body clock.
Primitive TL1 (pre-order)
Pre-orderCircadian lighting that automatically matches the sun all day long.
$349.00
Free Shipping
5 Year Warranty
30 Night Trial
Once you set the time, TL1 automatically provides the optimal brightness and color of light throughout the day to anchor your circadian rhythm.
Or, twist the dial anytime to easily shift to your preferred lighting.
Light engine
50 biologically optimized LEDs
Full-spectrum color from candlelight (2200K) to daylight (4500K)
2400 lumens (max)
Deep dimming to <0.1%
275+ EML
95+ color rendering index (CRI)
Flicker-free / UV-free / minimum EMF
Premium construction
Optical-grade glass diffuser
Die-cast aluminum + steel construction
50,000+ hour LED lifetime
Height: 14 inches / 36cm
Depth: 8.5 inches / 22cm
Width: 8.5 inches / 22cm
TL1 is expected to ship in fall 2026. We built the timeline around getting the product right, not getting it out fast. Orders placed now will ship in the sequence they were received.
Money-back Guarantee45-day money-back guarantee
Proven PerformanceMeets the WELL V2 Building Standard for Circadian Lighting
The science
Your body clock runs on light.
Light is the signal your brain uses to keep time: when to be alert, when to wind down.
For thousands of years, your body evolved to look for a specific pattern: bright sunlight by day, cozy firelight after dark.
Indoor light disrupts your body clock.
We now spend around 90% of our lives indoors,2 sending our bodies all the wrong signals.
Morning light that is 5x too dim and warm, lowering healthy cortisol and making you sluggish.
Evening light that is 5x too bright and cool, reducing melatonin production and ruining your sleep.
Science gives us an answer.
Biologists now agree on the signals your body needs from indoor light.
To meet these new requirements, we must control three things:
Spectrum
Specific wavelengths that stimulate your biology, not just color.
Dose
Light that actually reaches your eyes, not just lumens behind a shade.
Timing
The precise bright-to-warm arc your body expects across the day.
Scientists defined the three requirements for healthy light.
TL1 is engineered to deliver all three with no app, no scheduling, and nothing to manage:
Precise light dose
Calibrated for brightness, diffusion, and distance to deliver a precise circadian dose to your eyes.
Automatic circadian timing
Follows the precise bright-to-warm arc your biology expects, aligned to the scientific consensus (250 m-EDI to <10 m-EDI).
Benefits
The impact of healthy light
Independent researchers measured the specialized LEDs inside TL1 against standard lighting.
Engineered to meet the WELL v2 Building Standard for Circadian Lighting
The benchmark for human wellness in the world's most thoughtfully built spaces, typically only achieved with a $25K+ lighting overhaul.
Daytime
Wake up faster,
without caffeine
1.8×
Seoul National University
Think more
clearly
2.5×
Harvard Medical School
Nightime
Sleep better, without melatonin supplements
1.3×
Seoul National University
Fall asleep
more quickly
23%
Seoul National University
Backed by experts
Ben Greenfield
Performance Advisor
NYT bestselling author, consultant to athletes and executives, and leading voice in human performance and longevity.
Lauren Wood
Medical Advisor
Stanford MD with published neuroscience research and experience developing medical devices and therapies.
Testimonials
Feedback from 30 days with TL1.
“I stopped needing my second cup of coffee”
"I feel almost giddy, more energized and focused"
I wake up before my alarm now. My brain fog is gone.
Engineered to deliver perfect light
Every part of TL1 is designed to deliver the precise light you need.
How TL1 compares
Healthy lighting requires more than just changing colors. You have to carefully control the actual spectrum, dose, and timing. No other standalone product does all three.
Primitive TL1
Typical lighting (incl. smart bulbs)
Light therapy / SAD lamps
Architectural circadian systems
SpectrumThe wavelengths that set your body clock (~480nm).
Inconsistent
Morning only
DoseControlling what reaches your eyes via brightness, diffusion, distance.
Morning only
Circadian TimingPrecise scheduling for your biology. Bright mornings, warm evenings.
Manual setup
Build qualityLighting you want in your space, made to last.
Aluminum, steel, glass
Inconsistent
Low-grade plastic
$25K+ permanent installation
SpectrumThe wavelengths that set your body clock (~480nm).
Primitive TL1
Typical lighting (incl. smart bulbs)
Inconsistent
Light therapy / SAD lamps
Morning only
Architectural circadian systems
DoseControlling what reaches your eyes via brightness, diffusion, distance.
Primitive TL1
Typical lighting (incl. smart bulbs)
Light therapy / SAD lamps
Morning only
Architectural circadian systems
Circadian TimingPrecise scheduling for your biology. Bright mornings, warm evenings.
Primitive TL1
Typical lighting (incl. smart bulbs)
Manual setup
Light therapy / SAD lamps
Architectural circadian systems
Build qualityLighting you want in your space, made to last.
Primitive TL1
Aluminum, steel, glass
Typical lighting (incl. smart bulbs)
Inconsistent
Light therapy / SAD lamps
Low-grade plastic
Architectural circadian systems
$25K+ permanent installation
Meet our founders
Our goal was simple: bring sunlight indoors.
We learned how light shapes our energy, focus, and sleep… but we couldn't find an indoor light that delivered on this promise. So we built one. We started Primitive to make our lighting as simple as the sun: healthy, beautiful, and effortless.
Together, we bring 30+ years of product design experience from Stanford and Columbia, with over 1,000 lighting products brought to market.
Common questions
Primitive TL1 has a built-in clock that you set to your local time.
After that, it delivers a consistent, ideal light cycle — energizing mornings, calming evenings — regardless of what's happening outside.
Your body gets the same reliable rhythm every day, all year round. No apps or wifi required.
Many of the benefits are immediate. Research at Harvard Medical School and Seoul National University on TL1's LED technology showed improved alertness, focus, and cognitive performance during exposure.
Sleep improvements tend to develop over one to two weeks as your body's rhythm resets—like adjusting to more natural light in your daily routine.
Individual results may vary.*
TL1 works for night owls, shift workers, and non traditional schedules.
You can set TL1 to follow a custom solar cycle aligned to the timeframe that works for you whether your morning starts at 6am or 3pm. TL1 then delivers a biologically appropriate light progression based on that schedule.
Smart lighting is engineered for aesthetics and apps — not your biology. It typically has harmful blue spikes that disrupt sleep.
TL1 delivers the exact sun-like spectrum your body needs: timed perfectly throughout the day for health, performance, and rest.
SAD lamps are single-spectrum and uncomfortable to look at.
They're also easy to overuse. Too much exposure can overstimulate you and harm your sleep and health.
TL1 is as simple as the sun: functional, all-day circadian lighting that's beautiful and effortless.
Yes. While the TL1 is designed to run automatically to match the solar day, you have full manual control to adjust brightness and color whenever you need it.
Yes. In the morning, TL1 provides precise light for proper circadian activation and won't be affected by other lights.
In the evening, TL1's light is best. For any other lighting, avoid harsh, cool blue overhead light, or use blue light blocking glasses.
TL1 works beautifully in your bedroom. TL1's bright mornings can jumpstart your day as soon as you wake up.
In the evening, TL1 automatically shifts to extra-warm tones that minimize disruptive blue light so you can read, relax, and support natural melatonin before sleep.
When days become shorter in winter, getting a full day of light matters more than ever.
Throughout the year, TL1 provides full, precise days of sun-like light to support natural energy, sleep, and overall health.
You don't need two TL1s, but you might love having them.
A single TL1 delivers the all the circadian benefits you need. But two TL1s placed symmetrically can enhance visual comfort and provide beautifully even lighting for video calls and content creation.
Wake up energized. Fall asleep faster.
TL1 is the light your body’s been missing.
Primitive TL1 (pre-order)
Sale price
$349.00
Regular price
$379.00
Unit price
per