Replace the local microwave link.
All-optical downlink and uplink remove the intentional RF data carrier from the connection. Wired backhaul and deliberate radio settings make the exposure-reduction goal concrete.
RF Safe / Welcome to the Light Age
Keep the connection.
Change the carrier.
The next chapter of indoor wireless can travel through light. LiFi lets us keep the access, mobility, and possibilities of a connected world while taking microwave transmission out of the local data link.
Fiber to the building. Wire to the room. Light for the final meters.
A practical reason for optimism
Better connectivity.
Less reliance on RF.
We can redesign the connection around the room and the people using it.
A classroom needs a dependable network. A child needs a place to learn, move, and grow. Infrared LiFi offers an engineering choice that serves both priorities: retain digital access while removing an avoidable source of microwave transmission from that room’s network.
The change is tangible. An Ethernet cable feeds an optical access point. Invisible light carries data to a compatible receiver. Light also carries the return traffic. With the replaced radios switched off, that connection no longer depends on a microwave carrier.
This is something we can build, use, and improve now.
Explore the engineering
Same room.
New possibilities.
Switch the connection below. See how infrared separates data delivery from visible lighting and uses the room’s boundaries to shape coverage.
One room. Three ways to connect.
Choose the link, switch off the visible lights, or open the door.
Optical pathsRadio propagationCable
Infrared LiFi: the data link uses light
The access point and compatible receiver exchange data optically. Opaque walls block the direct light path.
Why this is worth getting excited about
Four improvements
you can design into a room.
Give the signal a smaller footprint.
Opaque walls block direct light. That creates a useful physical boundary around the network and an additional layer of privacy alongside encryption and authentication.
Step outside crowded radio channels.
An optical link does not contend for Wi-Fi airtime. It gives devices another communication medium in busy offices, classrooms, and environments sensitive to RF interference. [4]
Keep lighting on your terms.
Infrared can carry data without illuminating the room. Daylight, warm lamps, dimmed lights, or lights off: the networking function can be separate from the lighting experience.
The distinction that matters
“Pulsed” is a description.
It is not a diagnosis.
An infrared intensity pattern is not the same physical exposure as an amplitude-modulated microwave field.
The carrier, the absorbed energy, and the biological receiver determine an interaction. Sharing a word such as “digital,” “wireless,” or “modulated” does not establish a shared hazard.
The shared word “pulsed” provides no scientific basis for assigning proposed RF-disruption mechanisms to optical LiFi. Commercial optical-safety classifications provide affirmative evidence about the products’ assessed optical hazards. [31][32][33]
Understand the difference →Biological fidelity
Protect the conditions
for reliable biology.
John Coates’s central question is about resilience: can an avoidable environmental input make biological regulation less reliable?
RF Safe’s S4–Mito–Spin framework brings together ion-channel timing, mitochondrial regulation, and spin-sensitive chemistry. The research includes real biological responses under defined conditions and models exploring how those responses arise.
This framework motivates reducing a potential upstream stressor. Its proposed connection to chronic RF exposure remains a research question. The engineering response is already available: move indoor traffic to wires and low-power optical links.
Explore timing, susceptibility, and the named studies →A guide you can use and share
Follow your curiosity.
01 / PHYSICS
Why light changes the interaction.
Carrier, envelope, flicker, and actual optical-safety evidence.
Explore the physics → 02 / BIOLOGYWhy timing and the receiver matter.
CYB5B, CACNA1C, ion-channel models, and tissue selectivity.
Read the research → 03 / ADOPTIONMake your first room a LiFi room.
Actual equipment, an online order route, and a simple setup plan.
Get started →The person behind this guide
A promise.
A lifetime of work.
John Coates founded RF Safe in 1998. His commitment is personal: he describes surviving childhood cancer, losing his firstborn daughter Angel, and dedicating decades to finding better ways to connect.
John is a patent holder in optical communications and reports using LiFi in his own home for nearly ten years. His aim here is public education: help people see a practical route to less indoor RF and more choice in the technologies around their children. [13]
“Fear is not a solution. Better engineering is the solution.”
— John Coates