PureVLC brings its first Visible Light Communication (VLC) product to the market.
VLC transmits data wirelessly using visible light as its medium instead of radio waves. I wrote about VLC over a year ago when Harold Haas, professor of Mobile Communications at the University of Edinburgh, successfully demonstrated the VLC technology at a TED conference. He streamed a HD video to a screen using a LED light bulb as transmitter.
Haas co-founded PureVLC, a corporate spin-off of the university’s research project, to turn the technology into commercially viable devices. The company is now beta-testing its first product: the Smart Lighting Development Kit (SLDK).
Using the visible light spectrum to transfer data wirelessly will ease the burden on the overcrowded radio frequencies. The visible light spectrum is 10,000 larger than that of radio. VLC can potentially realize ultra high-speed transfer rates and high data density.
The SLDK enables manufacturers to add visible light communications to their existing lighting systems. The kit consists of a VLC ceiling unit and a VLC desktop unit. The manufacturer provides a LED light fixture and a standard LED driver to regulate the electricity powering the LEDs.
The ceiling unit is fixed between the LED driver and the light fixture so it can control the current going to the LEDs. Data is transmitted by changing the density of the light. A lower density represents a zero and higher density a one. Because the light changes superfast it is invisible to the human eye and can still function as normal lighting.
A standard Ethernet port connects the ceiling unit to a data network. The unit encodes the data onto the current feeding the LEDs. The desktop unit receives the data, decodes it and transfers it to a laptop or desktop computer. It can also send data to the ceiling unit.
VLC has its limitations. Other than radio waves it can’t penetrate barriers and needs line of sight to establish a connection. It is suitable for establishing wireless networks in homes, offices and places where radio signals can interfere with sensitive electronic equipment such as hospitals and airplanes.
About Tessel Renzenbrink
Tessel Renzenbrink holds an MA in philosophy and specialized in metaphysics. She writes about technology, energy and the changes in the cultural mindset that mark the shift towards the information age. 
Nice and interesting except this has been around a long time already and using lenses amazing distances have been achieved together with ultra bright 10mm red leds and even banks of them together with Fresnel lenses. Search the web and see the amazing things that amateurs have already achieved. The biggest advantage is that the data can be extremely secure with no encoding simply because you can’t intercept it unless you intercept the light path. With a highly focused LED it has to be the future in communication where pure speed is required. Fibre Optic has all but already proven that.
Well I had been working in a company in the States and they are doing the exact same thing. I think they have gone past the “turn on and off” stage and are experimenting with more advanced technologies.