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.