The importance of natural light… even when there are no windows
Windowless spaces are more common than they seem: basements, interior offices, waiting rooms, medical practices, spas, hotel basements, retail, and more.
And while they lack windows, they shouldn’t lack proper lighting. The solution lies in simulating sunlight indoors realistically and smartly, enhancing the well-being of people in those spaces.
Can sunlight be simulated?
Yes, but it’s not about simply installing a white light. To trick the brain and achieve a realistic perception, you need to replicate parts of the solar spectrum. It’s not just about color temperature—CRI, glare control, and circadian rhythm are also key.
Actilum develops specific LED technologies for these environments, where visual comfort and emotional impact are a priority.
Key elements to simulate real sunlight
| Característica | Recomendación | Tecnología Actilum |
| Color Temperature | 4,800K calibrated (Solar LED) | Solar Window / Luxpanel BIO |
| CRI (Color Rendering Index) | >98, with R9 (red) >92 | Luxpanel CRI100 |
| Glare (UGR) | Low: <16 | Optical diffusers + panel design |
| Light distribution | Homogeneous, no visible LED spots | Actilum® optical technology |
Spectral curve circadian lighting | Ultra Continuous, biomimetic, 380 to 780 nm Eliminates the typical “blue spike” of standard LEDs | Actilum Spectrum™ Phosphor violet technology |
Applications: Where and why use artificial sunlight?
- Interior offices → Increases focus and reduces eye strain
- Medical rooms → More human, less stressful environments
- Retail and shop windows → Enhances product color and shopping experience
- Hotels with no exterior windows → Feels more spacious and premium
- Waiting rooms and spas → Promotes relaxation and well-being
Simulating sunlight is not just aesthetic—it has proven benefits for health, productivity, and spatial perception.
Available Actilum systems
Actilum offers different systems depending on the type of project:
Solar Window
Designed to replicate a real window with artificial sunlight. Ceiling or wall-mounted, customizable, low glare, CRI >98, up to 7,200 lm (2020×700 mm model), and ultra-thin 22 mm depth.
Luxpanel CRI100
High-performance optical LED panel for furniture, false ceilings, or lightboxes with biomimetic solar spectrum.
Dynamic CCT systems
Tunable light supporting circadian rhythm. Controlled via Tuya Smart app, RF, Alexa, or Google Assistant.
Real-world results: Before and after installing simulated sunlight
In windowless offices, the incorporation of artificial sunlight panels has demonstrated:
- 17% increase in productivity in windowless offices
- Fewer complaints about eye fatigue
- Improved space perception (according to internal surveys)
In retail: enhanced dwell time at product displays
FAQs
Not exactly. True sunlight has a continuous spectrum. Cold light with poor CRI can feel artificial and lacks infrared stimulation.
Yes. Many clients install these panels in bedrooms, closets, bathrooms, or windowless hallways.
Minimal. Just occasional surface cleaning.
Yes. All systems support manual dimming, app control, or sensors.
No. Actilum LED panels have optimized thermal management and are safe for any environment.
Simulating sunlight indoors is not only possible—it’s increasingly essential. With professional LED technology from Actilum, you enhance both aesthetics and the human experience in interior spaces.
Solar Window
Price range: 505,78 € through 1.093,31 € VAT exc.