Energy & Mood

ENERGY & MOOD

More energy and a better mood start in your cells. Drive doesn't just depend on discipline. Energy supply also plays a role.

Start routine

In the office, it's 500 lux. Outside, on a grey winter day, it's 5000.*

* Typical illuminance levels: Office workstation 300–500 lux according to workplace directive ASR A3.4; overcast winter day outdoors several thousand lux. We spend around 90% of our time indoors (Klepeis et al., 2001).

What changes through light

01 · Getting up with difficulty becomes drive.

Until now: Your alarm rings, but you don't feel truly awake for a long time. In winter, it's dark during breakfast, so your body continues to receive a strong nighttime signal.

From now on: Five to ten minutes of light while the coffee brews. The study that investigated this focused precisely on that: less daytime fatigue, better mood scores.

→ You're awake when the day starts. Not just at eleven.

02 · From Afternoon Slump to Energy

Before: By afternoon, everything gets heavier – your head, your concentration, your mood. The usual solution is a fourth coffee, which can make it harder to fall asleep in the evening.

Now: Ten minutes of PowerDot on your wrist, laptop closed. Your cells receive a light stimulus that "charges" your cells with energy without needing extra caffeine.

→ Recharge instead of re-caffeinate.

03 · Evening irritability turns into more calmness.

Previously: The day was long, and even small things can be strenuous in the evening. Add to that overhead lighting and screens – your body remains in active mode.

From now on: You enjoy warm red room light. Because red light doesn't disrupt your internal clock, your body can more easily switch to rest mode.
More precisely: Our body reads the time of day through receptors in our eyes. Short-wave light, which comes from conventional light sources and especially from screens, activates us and thus disturbs the transition into rest mode in the evening. Red light, which is long-wave, is read by our eyes as "sunset" and can help the body wind down and then fall asleep more easily.

→ The evening is yours again.

16% less fatigue
8% better mood*

How it works

Neurons need a lot of energy

Thinking, sorting stimuli, staying calm — nerve cells do all of this, and they are among the hungriest cells in your body. If they lack energy, you don't notice it as a cell problem, but as fatigue. This energy is produced in the cell's powerhouses, where an enzyme sits that absorbs red and near-infrared light.

And then there's the rhythm

Your body tells the time of day by the light. But we spend the day indoors, where it's much darker than outside, and the evening under artificial light and screens. No wonder you lack energy in the morning and can't relax in the evening. Red light in the evening provides illumination without signaling "day" to your internal clock.

What studies show

The most significant work on this topic was conducted double-blind and placebo-controlled, in the middle of winter. It investigated mood, daytime sleepiness, and resting heart rate in people with mild sleep problems — all three values improved compared to the placebo group. A second study found similar results in female shift workers.

Improved mood scores during the winter months (56 participants, double-blind, placebo-controlled)
Less daytime sleepiness (56 participants, double-blind, placebo-controlled)
More stable resting heart rate (56 participants, double-blind, placebo-controlled)
Fewer sleep problems and lower stress levels after four weeks (female shift workers, randomized)

Sources:
Giménez, M. C., Luxwolda, M., Van Stipriaan, E. G., Bollen, P. P., van der Linden, R. L., Koopmans, P. J., Roosjen, M. H. G., Blomsma, L. L., Gordijn, M. C. M., & Reiter, R. J. (2023). Effects of near-infrared light on well-being and health in human subjects with mild sleep-related complaints: a double-blind, randomized, placebo-controlled study. Biology, 12(1), 60.

Liao, et al. (2025). The effectiveness of low-level LED light therapy for sleep problems, psychological symptoms, and heart rate variability in shift-work nurses. Journal of Nursing Management. (Check publication details.)

Tang, et al. (2023). Pulsed transcranial photobiomodulation generates distinct beneficial neurocognitive effects. Lasers in Medical Science. (Check publication details.)

Karu, T. I. (2010). Multiple roles of cytochrome c oxidase in mammalian cells under action of red and IR-A radiation. IUBMB Life, 62(8), 607–610.

Commission Internationale de l'Éclairage (2018). CIE S 026/E:2018 — System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light.

Which heilys® suits you?

£669.00

The device for morning and evening. Large enough for activation in the morning, and in the evening, indirect against the wall as a warm room light. Six wavelengths, each individually dimmable.

To the product

£89.00

The quick break for in between. Compact enough for the office and your travel bag. Ten minutes on your wrist instead of a fourth coffee.

To the product

£159.00

Compact for your desk or breakfast table. Facing you in the morning, turned against the wall in the evening.

To the product

Morning: Waking up with light

Place the device to your side while the coffee is brewing. Do not look into the LEDs. Afterwards, if possible, go outside for a short while — daylight remains the strongest time cue.

Panel or Gen30 · 5–10 min

Regarding Gen30

Afternoon: Instead of a fourth coffee

PowerDot on your wrist, laptop closed, stare out the window. Even without the device, taking a break is beneficial — the device can help you schedule them regularly.

PowerDot · 10 min · Wrist

Regarding PowerDot

Evening: From approximately 9 PM

Ceiling light off, panel against the wall. Warm red room light for reading, cooking, or doing nothing - and your evening won't be artificially prolonged.

Panel · indirect

To Gen70

REAL CUSTOMERS. HONEST OPINIONS.

What you're reading here are real experiences from customers using the Gen series.

Customer Reviews

Overall rating: 4.6 / 5 from 631 reviews.

Customer photo review of heilys® Gen30+Vision

Ich mag meine Helys Lampe sehr und nutze sie oft. Habe das auch schon meiner Familie empfohlen. Sollte sich jeder gönnen 🥳

Ulrike U. 5/5 Verified August 17, 2026

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16% less fatigue 8% better mood*

Which heilys® suits you?

Your heilys® energy routine

Morning: Waking up with light

Afternoon: Instead of a fourth coffee

Evening: From approximately 9 PM

Customer Reviews

What Doctors & Therapists Say About heilys®

Prof. Dr. Ottaviano Tapparo

Dr. med. Luise Weinrich

Dr. med. Katharina Broos

Martina & Gerda Kastner

Angela Schoer

Thomas Hartl

Julian Mai

WHAT MAKES HEILYS® STAND OUT

UNABHÄNGIG GEPRÜFT

20+ JAHRE LICHTEXPERTISE

IN DEUTSCHLAND ENTWICKELT

Frequently Asked Questions - FAQ

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16% less fatigue
8% better mood*