Prof. Harald Haas - My Li-Fi Revolution

In the 2014 Tam Dalyell Lecture, Professor Harald Haas, Chair of Mobile Communications at The University of Edinburgh, reveals an amazing innovation that could change wireless communications forever.

The Li-Fi system uses standard light-emitting diodes (LEDs) to transmit electronic data signals, which will enable users to access the internet through the ordinary lighting systems in schools, workplaces and homes. This revolutionary invention has the potential to bring cheap, energy efficient and super-secure wireless access to the world.

Recorded on Sunday 13 April at the University of Edinburgh's Playfair Library.

[Chifalcon]

A very promising technique for in-door communication of smart furnitures.

[laichong]

can more than one person use a lightbulb at the same time?

[waseem]

Thanks very much HERALD HASS for uploading this video on youtube .... I have taken this topic as my Technical seminar in my final year engineering... thumps up ;) and what u have explained is Flawless ;)

[vlad]

All the more reasons we should submit ourselves to new rulers: technocrats.

[piotrtyc]

Very nice talk. One of the most interesting events during Edinburgh Science Festival 2014 :D
Looking forward to the next one in 2015 :D

[JN]

why didnt he answer the distance question ?    yes there has been concern about using LED's in the house  (if you goof LED light health risks, plenty of articles.).    With regards to RF health risks, the documentary 'Resonance' was  does anyone know of any useful products that are actually using this tech.?

[malcolmmarzo]

Interesting how technologists dismiss the safety concerns of digital communications systems, saying "there is no scientific evidence of harm." When in fact there is ample evidence.

[itnetdroid]

Not Revolution...basicly Lifi like F.O system. differnt in medium. Lifi medium is air. F.O medium is fiber.

[sherri]

Prof. Harald Haas - My Li-Fi Revolution. In the 2014 Tam Dalyell Lecture, Professor Harald Haas, Chair of Mobile Communications at The University of Edinburgh, reveals an amazing innovation that could change wireless communications forever. 

The Li-Fi system uses standard light-emitting diodes (LEDs) to transmit electronic data signals, which will enable users to access the internet through the ordinary lighting systems in schools, workplaces and homes. This revolutionary invention has the potential to bring cheap, energy efficient and super-secure wireless access to the world.

Recorded on Sunday 13 April at the University of Edinburgh's Playfair Library.

[Space-Industries]

This is fascinating technology and I expect to see it explode in production and implementation.

I was wondering, why was ir used for transmitting data back?
Is there a problem with transmitting a message back using light?
Would it be possible to transmit at different frequencies for up/down link?

-For example you send 1 million flickers/sec for upload & 2 million flickers/sec for download? Or is the nature of light such that the signals would be misread under these conditions? Perhaps better optics are needed to distinguish # of flickers/sec?

[sachinkumar-qruf]

If two persons using internet in a room by li fi then any one of them can steal the data .so how secure this?

[Ken-S]

7 years has past, what's the reason behind that not everyone is using it? 🧐

[alexmuzinga]

you can use your lamp outside of the house?

[tchippat]

very impressive to see what  light  can carry  and  accomplish.

[FiloTh]

29:15 What kind of LED have just only 5mW consumption ?  I know than mW are standart for Laser Diodes, but also units mW for LED? 

[paterosisboring]

I love the concept, abundant blessing to the inventor!

[nicholaswmoore]

Hmmm I'm not sure if I see the need. 3G goes through walls better than light does which means less infrastructure is needed. There may be less radio spectrum than light but there's enough that people in such high density areas like Times Square or a busy venue can still get adequate data coverage. You want to use light, use lasers to beam down from satellites to ground stations and blanket large areas with 3G from there. As for speed, there are already wifi routers that can transfer at 1GB per second. Maybe there's something here but it seems needing light could be a major reliability problem. He does make a good point about using to transmit underwater. Underwater transmission is a major challenge since it requires by low frequencies which can't transmit high throughput.

[b.youssef]

Hello Any one Now how it work with multiple users ?

[barbsense]

What a ridiculous thing to say ... that mobile phones are more important than light, water, and electricity.

[shreddedreams]

its all good, but does anyone see the need for it? wifi is a nice complement to 4g outdoors... and with 5g in door speeds will be in the gigabits anyway *

?...

Seriously, the level of additional equiptment needed to retrofit a whole house with lights that cover every area (to stop dropping signal) would be huge * ! and expensive, how much did it cost to refit all the leds in your home? let me guess.. a couple of hundred pounds / dollars ? so this would be the same.

not to mention, in the near future people wont go into a building and use their wifi they will just use 4g, because it will be faster, there will be no lengthy connection time / password issues... AND most importantly the 4g won't be snooped upon, whereas the network traffic can be clearly seen by the host of the lifi network *

Any problems with my criticism ? if so, please comment..