Q & A
What is LiFi?
LiFi is a way of transmitting data - including the internet – to devices such as smart phones, tablets, etc... using visible light from LEDs pulsed at high frequency.
Is it completely new?
Not really. The remote control you use to send instructions to your TV uses invisible infrared light, and, at the other end of the scale, lasers send vast amounts of data down fiber optic cables to provide telecoms and broadband services, so the principle has been around for decades. The advent of LED lighting, which can be switched on and off instantaneously, has further enabled this technology.
How fast is it?
LiFi can perform more than 100 times faster than Wi-Fi, which would mean you could download HD movies in seconds.
Would I notice a difference in my lighting system equipped with LiFi?
No, because the lights are pulsed at extremely high frequencies which is undetectable to the human eye. It operates at many hundreds of times faster than high-frequency lighting power supplies or ballasts which are used today.
How do devices download information using LiFi?
One option is to use the forward-facing camera on your smart phone or laptop. Applications already exist in the iOS and Android app stores. In truth, the components required to deploy this technology are much simpler than Wi-Fi or Bluetooth. Think about how many devices already have some sort of light-sensing capability to enable functions such as automatic screen dimming. Alternatively, a plug-in dongle with built-in photoreceptor receives the information.
How does data get into the lighting system?
The light transmitting the data would need to be connected to the internet or network. This could be with a fiber or Ethernet connection via an inline driver.
What are the advantages over Wi-Fi?
The amount of data which can be transmitted over Wi-Fi is limited; the more users or devices which are trying to communicate, the slower it becomes. Ever tried to connect to Wi-Fi in a busy exhibition hall or airport departure lounge?
In many situations LiFi could be safer than Wi-Fi. The radio frequencies used in Wi-Fi can interfere with sensitive electronic equipment, for example in medical equipment or hazardous locations found in chemical plants.
What about security?
Light can be made very directional, and obviously can’t travel through walls, so to eavesdrop or hack a system you need to be able to see the light.
Can lights still be dimmed when using LiFi?
Yes, lights can still be dimmed without compromising network speed or range.
Does LiFi require line-of-sight to operate?
No, LiFi does not require a line-of-sight between the transmitter and receiver.
What's the difference between germicidal UVC & FAR-UVC?
FAR-UVC is the only wavelength proven safe for use in occupied spaces to efficiently neutralize pathogens without damaging human skin or eyes. Germicidal UVC (254nm wavelength) can damage human tissue and therefore can only be used in unoccupied spaces.
For more information, links to numerous safety and efficacy studies regarding FAR-UVC can be found under the REFERENCES & RESOURCES link below.
What are the advantages of continuous 222nm FAR-UVC disinfection over other methods?
222nm FAR-UVC: Safely & effectively sanitizes air and surfaces by destroying pathogens such as viruses, bacteria, mold and spores by delivering an appropriate dose of invisible disinfecting light.