Tunable White
Human Centric Lighting

Human Centric Lighting – HCL
Daylight, a natural regulator of our organism
Some parts of human circadian rhythm (24 h) 
Thanks to evolution, our lives and our activities are driven by the natural day-night cycle. Throughout the day, when plenty of natural light is available, we are active and perform all our activities, such as school, work, hobbies and entertainment. The evening is a period when the light fades and gradually weakens. With darkness comes the time for a needed rest.
Our everyday cycle developed as an adaptation to the environment that surrounds us. Scientific research has confirmed that compliance with the natural day-night cycle is not only a practical thing but it is also deeply rooted in our nature. Type of light affects the human organism, the production of vitamins and production of melatonin that regulates sleep, therefore has a direct impact on mood and health of our bodies.
About 80% of our sensory impressions are registered through our eyes. And it is a quality of light that determines how well we see and perceive our surrounding. Lighting type has a key impact on our eyesight and it directly affects our mental and physical well-being.
The principle of HCL is to imitate the natural daylight in the interior with the use
of artificial luminaires.
Natural daylight changes dynamically throughout the day in terms of intensity and colour temperature. And this has a direct impact on our biological rhythm which is called
the Circadian cycle, that controls human biological clocks. For its proper functioning and thus our health it is necessary to follow the preset cycles of the human body.
The colour temperature of natural light develops from 1 900 K (at sunrise) to 7 000 K (at noon) during the day. In the evening, it gradually decreases to the value around 2 700 K. It is a signal for the human organism to prepare for sleep.
Pluses and uses of the Human Centric Lighting
Mainly suitable for areas where people spend much of their daytime:
Main advantages:


Correct lighting helps a human body synchronize with the “natural day-night rhythm”. It is healthier for the biological system and it is important for the proper
production of melatonin that is crucial for good sleep.


Proper lighting keeps us alert and efficient throughout the whole day.


Light has a key influence on our sight and it directly affects our mental and physical well-being and the health of the whole organism.
Tunable White – 4 different solutions
Solution that meets all individual requirements and is suitable for each installation size
1. Switch-Control – single control button

• No additional components needed
• No complicated programming or system setup requirements
• Cheapest solution for Tunable White control
• Solution just for one luminaire
• Only basic functions – colour & intensity adjustment
• Preset can only be set externally via PC

2. Skyline – button panel

• Solution includes 4 preset Tunable White scenes simulating different weather conditions
• No complicated programming or system setup requirements

• Solution just for one luminaire
• When using multiple luminaires in random mode, each shines in a different colour
• Additional components needed


  • Simulation of natural lighting changes with light intensity and temperature adjustment
  • Just for one luminaire/driver
  • No complicated system setup needed, it works instantly after installation
Preset scenes and the button panel
3. Spectra – stylish user interface

• Intuitive setting of Tunable White luminaires right on the wall
• Solution for up to 63 luminaires Tunable White
• Perfect design into a normal installation box
• 4 scenes with a possibility of direct adjustment by the user
• Manual colour temperature and light intensity correction
• Bluetooth – control via smartphone/tablet
• App for iOS and Android for free

• Additional components needed

Spectra panel – different material and colour variations
  • Modern design
  • Control panel with a touching screen
  • No programming needed
  • Bluetooth
  • Wireless control via smartphone/tablet
4. Vision – HCL Project solution

• Any control options – buttons, touch panels, wireless access, schedules
• Possibility to control any number of luminaires in one system (max. 32 000)
• Possibility to set individual daily plan (according to an individual circadian rhythm of a person)
• Matching the colour temperature to the time of a day and season
• Overview of the status, consumption and failures of individual luminaires
• Customized graphical applications
• Possibility of regulation of lighting intensity according to daily contributions of light
• App for iOS and Android for free
• Additional components needed
• System specification and configuration must be always tailored

Following luminaires support all four solutions (Switch-control, Skyline, Spectra and Vision)
Ceiling and suspended LED luminaire
Salemo LED HCL
Recessed LED luminaire
Recessed LED luminaire
Recessed LED luminaire
Arietis LED HCL
Recessed LED luminaire IP65