Sunday Light

Key Benefits

• Supports a healthy circadian rhythm.

• 34,500 lumens of full-spectrum light.

• Automatically follows the natural day.

• Silent liquid-cooled technology.

• 97+ CRI sunlight-quality lighting.

Sunday is the world's first sunlight machine, engineered to bring daylight-level brightness indoors. Instead of sitting close to a small light source, Sunday fills an entire room with bright, full-spectrum light that feels natural and comfortable.

Most indoor spaces are 50 to 100 times dimmer than natural daylight. Sunday was designed to solve this by delivering 34,500 lumens of light across the whole room, helping create an environment that better reflects the changing light of the day.

A large reflective panel disperses light the way the atmosphere scatters sunlight, creating both a bright "sun" and a soft, sky-like glow. The result is indirect, comfortable illumination, even at exceptionally high brightness.

Its innovative liquid-cooled system allows Sunday to maintain this high light output while operating silently. High-fidelity LEDs produce a Colour Rendering Index (CRI) of 97+, helping colours appear vibrant and true to life, while the adjustable colour temperature shifts automatically from a cool 6000K daylight to a warm 2650K evening light. With deep dimming and optional scheduling, Sunday follows the rhythm of the day from morning through to night.

Specifications:

Dimensions & Weight
120 × 110 × 70 cm (48 × 44 × 28")
22 kg

Recommended Ceiling Height
Minimum 240 cm (96")
Please contact us if your ceiling is lower.

Light Output
34,500 lumens total
10,000 lux at 60 cm

Light Quality
Colour temperature: 2650K–6000K
CRI: 97+

Power & Compliance
400W
CE, UKCA & RoHS certified

What's Included

• Sunday Light Unit
• Ceiling Mounting Kit
• Remote Control
• Installation & App Setup Guide

Most lights are designed to help you see. Sunday is designed around how your body responds to light. Light is one of the strongest signals for your circadian rhythm, the internal clock that helps regulate alertness, hormone release, and your natural sleep-wake cycle. Specialised receptors in the eyes detect light intensity and send signals to the brain's master clock, yet most indoor spaces are still 50 to 100 times dimmer than natural daylight, even when they appear bright.

Sunday is designed to bridge that gap. It delivers 34,500 lumens of full-spectrum light across an entire room. Its large reflective panel disperses light in a way that mimics how sunlight is naturally scattered through the atmosphere, creating bright, comfortable illumination rather than harsh, direct light. Unlike traditional ceiling lights or SAD lamps, Sunday delivers daylight-level, full-spectrum light across an entire room using a large reflective panel that diffuses light in a way that more closely resembles natural sunlight.

By bringing daylight-level light indoors in a practical, whole-room format, Sunday transforms something we rarely think about into part of a daily wellbeing routine. It quietly supports the environment where we spend most of our lives, making better light feel less like a treatment and more like a natural part of living well.

With our Healf Curation Process, we do the work for you. Shop with confidence knowing that every item has been tried, tested, and curated for you.

Learn more about each step—Brand Discovery, Expert Validation, and Community Testing—here.

For the complete setup guide, please follow the manual that comes with the product.

How to use:

Start in the light:
Spend your first half hour of the day under Sunday Light. Whether it's having your morning coffee, breakfast or first emails. This is the signal that sets your whole day.

Let it run:
As the day progresses, light plays a different role. While its circadian influence is strongest in the morning, sufficiently bright daytime light is associated with increased alertness and mental clarity.

Wind down warm Sunday automatically shifts through the day from cool, bright light to warmer dimmer light by afternoon.

The room tells your body the day is ending, so sleep comes easier.

Bring the season forward:
On dark mornings, use Sunday Light to start your day earlier. A bright start holds your mood and energy through the shortest months.

Land in the right time zone:
Use Sunday's jet lag management features to ease jet lag before and after travelling.

Trust how it feels. Set your schedule once and let it run for you every day. Sunday is built to be lived in, not an extra step in your routine.