Hi Shamonto,
I am the author of the post @ http://www.costayannakis.com/uncategorized/arduino-based-li-fi-system/
Consumer LiFi systems, to my knowledge, are not available commercially and are still in the experimentation phase. If you are serious about LiFi you may have to consider creating your own device. My device had a maximum transfer rate of 1,000 bits and was more to show the theory of how an led can be used to transfer data. I have also transferred data via a laser to a printer as shown here:
These are both "line of sight" systems whereby if you break the line you lose some of the data.
I think you have to be clear in what you want to do and the purpose.
Feel free to ask me any question and I will endeavour to answer