Cronos | Well-Being Through Light
The Cronos luminaires help synchronize users’ biological rhythms by replicating the sun’s light cycle in real time, enhancing overall well-being.
This breakthrough innovation, developed in close collaboration with a team of neurobiologists and physicians, enables the general public to access circadian lighting technology previously reserved for elite athletes and NASA’s manned space missions.
The Circadian Rhythm
The circadian rhythm is a biological cycle that governs a range of vital physiological processes necessary for the proper functioning of the human body. It lasts about 24 hours and is regulated primarily by natural light, which acts as its main synchronizer.
Today, people spend more than 90% of their time indoors, exposed mostly to artificial lighting. The lack of natural light exposure disrupts the biological rhythm and has contributed to a reduction in average daily sleep time by about one hour over the past 100 years.
Cronos by Lucibel
Lucibel has developed an innovative luminaire that synchronizes individuals’ circadian rhythms by replicating sunlight and its effects on the body.
While ensuring optimal visual comfort at all times, the Cronos luminaire varies in intensity and color temperature following a preset scenario throughout the day. This scenario, defined in collaboration with neurobiologists and sleep physicians, replicates the natural light cycle over a period of 8 to 10 hours, depending on your preference.
What are the benefits?
• Enhances concentration, alertness, and memory.
• Optimizes the sleep-wake cycle.
• Improves daytime efficiency and overall well-being.
References
A Clinical Study Demonstrates the Benefits of Cronos
To validate Cronos technology in real-world conditions, Lucibel subjected it to a clinical study designed and conducted by an independent, expert third party. The findings from this study come from an evaluation coordinated by the Sleep Center of Hôtel Dieu.
The study was carried out over 28 days with 70 employees of the Nexity group.
The results are impressive: 75% of participants experienced improved performance, reduced drowsiness, and reported better-quality sleep when exposed to Cronos lighting.
Study Results
Cronos Boosts Performance and Alertness
(Speed and Decision-Making Tests)
Vigilance measurements show a significant reduction—over 15% decrease in reaction time for 3 out of 4 individuals under Cronos lighting.
Distribution of Reaction Time Reduction Rates Between the Two Study Periods for the Cronos Group and the Control Group (Under Standard Lighting).
Cronos Reduces Sleepiness
(KSS* Test)
Sleepiness decreases throughout the day under Cronos lighting. Attention is significantly improved for 3 out of 4 individuals.
* Karolinska Sleepiness Scale
Distribution of Sleepiness Reduction Rates at 2 PM Between the Two Study Periods for the Cronos Group and the Control Group (Under Standard Lighting).
Perceived Improvement in Sleep Quality
(Sleep Questionnaires and Actigraphy Records)
Under Cronos lighting, 3 out of 4 people reported better-quality sleep. For 1 in 4 individuals, sleep quality was dramatically improved, with a gain of 43%!
Distribution of Perceived Sleep Quality Improvement Rates Between the Two Study Periods for the Test Group.
With Cronos, 3 out of 4 users experience all the benefits of a day spent in the sunlight!
The New Dior Spa, Located at Plaza Athénée Paris
The new Dior spa at Plaza Athénée Paris unveils an exceptional retreat: the Dior Light Suite, a first in a Parisian palace and the best-kept secret of the Plaza Athénée.
Inspired by light therapy, this treatment room features a unique ceiling that perfectly replicates sunlight. This LED-embedded sky emits natural light in three intensities: Energizing, Relaxing, or Regenerating.
Exclusively developed with Lucibel, this ‘Cronos Light’ resynchronizes circadian and chronobiological rhythms that influence daily well-being. It provides the ideal daily dose of light, essential for balancing energy and sleep, reducing signs of fatigue, and enhancing the skin.
Dior brings its full expertise to three exclusive 1.5-hour treatments—each matching the duration of an ultradian cycle—that naturally harmonize the day. These customized therapies are designed to meet individual needs, inspired by the sun’s course and accompanied by precise movements that evolve in sync with the light intensity.
The Energizing ritual recharges and awakens both body and mind, harmonizing the biological clock and emotions. It draws from the soft hues of dawn, gradually blossoming into the brilliant rays of a sun at its zenith, infused with the blue of the sky, all accompanied by movements that reactivate the body.
The Recover ritual envelops the body and mind in the brightness of a full day, gently transitioning into a soft amber twilight to promote recovery and reconnect with quality sleep. Promising deep relaxation, it combines a soothing massage, a restorative nap phase, and stimulating movements.
Finally, the Rest ritual mirrors a sunset sinking into the evening’s calm, inviting relaxation as a prelude to peaceful sleep. Acting as a true decompression chamber before bedtime, this ritual alternates sensory stimulations through light, ensuring the release of both muscular and mental tensions.
Lucibel collaborated with skipper Charlie Dalin.
Lucibel collaborated with skipper Charlie Dalin to develop an innovative lighting system on the IMOCA MACIF Santé Prévoyance, which supported his recent victories in the Transat New York Vendée and the Vendée Globe.
Charlie Dalin is one of the most talented skippers of his generation.
His track record reflects exceptional sailing skills at sea and a constant spirit of innovation on land, which includes his collaboration with Lucibel’s R&D team.
Since 2023, Lucibel has been supporting Charlie Dalin in a precise optimization of his race performance, both on the human and technical fronts.
As part of this precision approach, Lucibel’s R&D team designed and installed a custom luminaire on the ceiling of the living area of his boat. This lighting system helps regulate the sailor’s sleep-wake cycle according to race needs, addressing a critical factor for his performance at sea.
Combining low melanopic ratio LEDs without blue light to promote sleep onset, along with high melanopic ratio LEDs to enhance alertness and responsiveness, this technology is inspired by the research of Dr. François Duforez, a sleep specialist and medical partner of our company.
Frédéric Granotier, Founder, Chairman, and CEO of the group, commented:
“Collaborating with an athlete of Charlie Dalin’s caliber is a fantastic opportunity for us to test our expertise in an environment where the quality of equipment is crucial. The circadian lighting system we designed for this purpose relies on Lucibel’s two core strengths: its technological expertise in precision light engineering and its ability to apply the latest medical discoveries in light therapy.”
Charlie Dalin, skipper of the IMOCA MACIF Santé Prévoyance, added:
“Transatlantic races demand an unparalleled level of optimization—nothing is left to chance: every detail counts to win! Being deeply committed to innovation as a key factor in sporting performance, I naturally collaborated with Lucibel to enhance efficiency in these vital areas of sleep quality and alertness during a race.”
