LiFi, Light and Life – Forward to Nature
Can technology move closer to nature, instead of further away from it? LiFi offers an interesting case to reflect on.
Why LiFi matters
Over the last two decades, wireless technologies have quietly filled our homes, offices, schools, and cities. We are constantly connected, often without noticing how deeply these systems shape our indoor environment. WiFi routers, mobile phone towers, smart meters, Bluetooth devices, and now IoT systems create a constant background of radiofrequency electromagnetic fields (RF‑EMFs). From a building biology perspective, this raises serious questions. A growing number of people report symptoms such as sleep disturbance, headaches, heart rhythm issues, concentration problems, and general fatigue when exposed to strong or chronic EMF sources.
While scientific debate continues, precaution is a core principle of building biology: if there is reasonable concern, exposure should be reduced where possible. This is where LiFi – Light Fidelity – enters the discussion. LiFi uses light instead of radio waves for wireless data transmission and is often presented as a safer, more natural alternative.
What exactly is LiFi?
LiFi is a wireless communication technology that transmits data using light, usually from LED lamps. Instead of sending information through radio waves, data is carried by light itself. The light intensity is modulated at very high speeds, far faster than the human eye can perceive. To us, the lamp appears to give steady illumination, while in reality it is simultaneously sending digital information.
In simple terms, LiFi has a few important properties:
It uses visible light (and sometimes near‑infrared), not radiofrequency radiation.
The signal does not pass through walls; it remains confined to the illuminated space.
It can offer very high data speeds and low latency.
Each light source can act as a small, local data cell.
Because light is already used for illumination, LiFi is often described as a dual‑use technology: lighting and data transmission combined.
Beyond biological and health aspects, LiFi also offers practical advantages. Because light does not pass through walls, data transmission remains confined to the room where the lamp is installed. This strongly reduces the risk of unauthorised access from outside, making LiFi inherently more secure than WiFi. This property is particularly relevant for offices, hospitals, research facilities, and private homes where data privacy is important.
A building biology perspective
From a building biology viewpoint, LiFi has several attractive features that are worth closer attention. Humans and all life on Earth evolved under sunlight. Visible light is a natural part of our environment, whereas microwave frequencies used for WiFi are biologically novel.
The fact that LiFi signals remain within a room is also important. Unlike WiFi, which often leads to involuntary exposure from neighbours, nearby offices, or public infrastructure, LiFi is largely a voluntary choice: you are exposed only when you choose to switch on the light and use the connection. In an apartment building or hotel, this difference is very clear: WiFi signals from other rooms and floors are always present, while LiFi remains limited to your own room. This reduces involuntary exposure from neighbours, nearby offices, or adjacent apartments – a common issue with WiFi. In sensitive environments such as bedrooms, clinics, schools, or retreat centres, LiFi could support a more controlled and calm electromagnetic environment.
LiFi also fits well with good building biology practice: wired connections where possible, and wireless only where truly needed, limited in space and time.
A note of healthy scepticism
At the same time, building biology encourages critical thinking. LiFi is not automatically “healthy” just because it uses light. Important questions remain:
What modulation frequencies are used, and do they affect the nervous system?
How does prolonged exposure to modulated LED light compare to natural daylight?
Will LiFi systems encourage even more screen time and digital load?
There is also the practical reality: LiFi requires lights to be on, at least dimly. This may not suit all situations, especially at night. As with any technology, poor design or overuse could undermine potential benefits.
A personal reflection: Forward to Nature
Forward to Nature does not mean going back to caves or rejecting technology. It means recognising that humans are part of nature, not separate from it. Technology can support life and health, but only when it respects natural limits and biological realities.
In my view, nature and technology do not have to be enemies. When designed with care, they can live together and even strengthen each other. Light-based technologies like LiFi are an example of this direction: using a medium that is already part of our natural environment, instead of adding ever more artificial exposures.
Much of today’s modern technology is introduced mainly for speed, control, and profit, often ignoring its impact on nature, human health, and the wider ecosystem. Forward to Nature is a call to choose differently: to integrate technology in a way that supports life, awareness, and long-term balance.
In conclusion
LiFi represents an interesting step in the direction of “forward to nature”: integrating modern technology while respecting biological limits, rather than ignoring them. Compared to WiFi, it offers clear advantages in terms of exposure control, privacy, and alignment with natural light environments. When signals do not leak outside the room, people nearby are less exposed. In this way, privacy and health go together: less exposure, less leakage.
However, LiFi is still developing. Standards, health research, and real‑world experience are evolving. The future likely lies in a balanced approach: more wired connections, selective use of LiFi where appropriate, and less reliance on blanket RF‑based wireless systems.
Forward to nature does not mean rejecting technology. It means choosing technologies that support life, health, and awareness – and remaining willing to question them as we learn more.
How do you see this? Could light-based connectivity be a meaningful step toward healthier and more conscious buildings, or do you see other paths forward?
— René Janssen, Building Biology Consultant