Tunable White Lighting: What You Need to Know

Posted May 19, 2026 by Natalie

A minimalist contemporary kitchen with human centric lighting split into 5 sections, each one showing the different light temperature and brightness used for different parts of the day

Lighting doesn’t just have to be ‘on or off’ any more. Tunable white lighting – also known as variable white, hybrid white or CCT adjustable lighting – works in harmony with our circadian rhythm by allowing us to adjust the shade of white light within our interior space. But why does this matter?

Tunable white lighting is the foundation of Human Centric Lighting - also known as circadian, wellness or biodynamic lighting. This emerging concept is a combination of dynamic electric light, natural daylight and insightful design. Whilst it cannot replace daylight entirely, it can replicate many of the health benefits that we receive from the sun’s natural progression throughout the day including supporting our mood, sleep, energy and productivity.

Human Centric Lighting is an essential part of contemporary, human-focused architectural design. This field is developing rapidly and we’ve seen the demand for tunable white fixtures rise as a result. Let’s look at how this cutting-edge lighting technology is revolutionising the way that we experience our indoor environments.

Tunable White Lighting: A Definition

Tunable white LEDs allow us to select the specific correlated colour temperature (CCT) of the light in our environment and also to change this colour whenever we choose – standard LED lighting cannot do this.

What is CCT? It’s a measurement of the colour of white light using the Kelvin (K) scale, for example:

2700K = warm white light
6500K = cool white light

Tunable white lighting is fully adjustable and has no fixed, preset settings, e.g. ‘warm white’; instead it offers a continuous range of CCTs to choose from which usually fall between 1800K (candlelight) to 6500K (daylight).

Why Tunable White Lighting is Important

Wish that you could get the health benefits that sunlight has to offer whilst working and playing indoors? Well, tunable white light brings that dream a little closer to reality. Although it does not provide full spectrum light like the sun, you can create automated biodynamic and human centric lighting control programmes that mimic our natural exposure to daylight. This helps to maintain our natural balance by regulating our melatonin and cortisol production throughout the day.

And there’s more! Here are just some of the many functional and aesthetic applications of tunable white lighting technology:

Human Centric Lighting

Mimics daylight patterns from the natural world
Supports our circadian rhythm to regulate sleep, alertness etc.
Supports patient healing in hospitals, treats sleep disorders & even minimises jet lag in hotels.

Mood & Productivity

Cool light - replicates bright daylight, increases focus & productivity
Warm light - replicates sunrise/sunset, supports relaxation & comfort
Energises school students, invigorates shift workers & calms care home residents.

Flexibility in Spaces

Algorithms ensure smooth colour transitions and fully customisable brightness, creating a whole range of different atmospheres.
One space can serve multiple purposes.
E.g., a daytime workplace becomes a more relaxed, social setting after office hours.

Design & Visual Impact

The colour or intensity of light can be selected to enhance interiors, retail displays & artwork.
Complement seasonally-changing room finishes, match re-branding hues or create a mood.
Applications include shops, hotels, galleries - even home renovations.

With tunable white, one light source can mimic different natural lighting conditions. It can be tailored to suit our individual requirements resulting in better comfort, productivity, wellbeing, and even design flexibility.

How Tunable White Lighting Works

We’ve looked at what tunable white lighting is and why you need it - now let’s find out exactly how tunable white allows you to achieve the specific light colour and intensity that you want.

This non-static lighting technology is more complex than traditional static LED light sources; brightness and colour are controlled independently from one another to ensure that the colour of the light does not change even when it is dimmed or brightened.

This is achieved by blending mixed colour LEDs and requires a compatible control system:

LED Mixing

Tunable light fittings have sets, or arrays, of different colour LEDs on the same board, e.g. warm white and cool white.

Blending Light

Individually adjusting the intensity (brightness) of each LED changes the output colour of the entire lighting fixture or scheme.

Control Systems

A compatible control system is essential and consists of:

Drivers:

The tunable white LED driver receives commands from the control system and:

Regulates the relative output of the sets/arrays of LEDs to achieve the desired CCT (e.g. 6500K cool white to replicate daylight).

Regulates the overall output to achieve the required brightness (e.g. 300-500 lux for optimal productivity).

Control Unit:

Popular controls include:

The user interface can be a simple wall switch or sliders, or via the control system app on your smart phone or tablet.

Tunable White Lighting Automation

Tunable lighting systems can be operated manually but they deliver their best results when you set up pre-programmed scenes. Automated scenes created using smart controls can automatically adjust indoor lighting CCT and intensity to:

Motivate productivity & focus
Create a calming environment
Support our natural circadian rhythm

Smart tunable lighting technology can also use time, date and GPS geolocation data to regulate the body’s 24-hour biological clock by replicating and working in harmony with:

The natural light dynamics of the day-night cycle
Weather patterns
Seasonal variation

And for total control, automated scenes and settings can be instantly overridden at the touch of a button when needed.

Tunable White vs Other Dynamic Lighting

Tunable white isn’t the only non-static LED lighting available, so how does it differ from other options? Let’s compare the three main types:

Tunable White

Adjustable white light only, not multi-coloured
Its brightness & colour change independently of each other
Subtle, functional changes.

Dim-to-Warm LEDs (“Warm Dim”)

White LED light which becomes a warmer white colour when dimmed
Similar appearance to incandescent lamps when dimmed
Light intensity cannot be changed independently of colour temperature.

RGB Lighting (“Colour Changing Lights”)

Changes colour temperature across the entire visible spectrum including colours other than white
More decorative than functional
Used in restaurants, theatres, theme parks etc.

As you can see, Tunable White lighting technology is more state-of-the-art than other non-static LED lighting: it offers control, flexibility and human-focused benefits and is far more than just a decorative ‘nice-to-have’.

The Future Looks Bright with Tunable White

It’s easy to understand why these tunable white systems are now an essential part of our modern lighting schemes and smart, human centric environments. Tunable white offers us so much more than static LEDs including health and productivity benefits, and biodynamic settings which change automatically throughout the day but can be manually overridden when needed. With so many known applications already, we’re excited to discover what other future benefits this dynamic technology will offer us in our healthcare settings, workplaces, retail environments and homes.