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Li-fi technology guarantees internet access using light

Transmission using light has been around for some time, in remote controls on TVs, for example. Since then, many labs have been working on ways to get a greater amount of information more quickly and efficiently transmitted. In 2011, German Harald Haas, a professor at the University of Edinburgh, coined the term Li-Fi, aiming at a proposal in which each lamp becomes an internet access hotspot

For the system to work, the LED lamp will transmit the signal, making small swings in its light (in nano seconds, totally imperceptible), and will need a device that has a specific receiver for this, a light sensor that interprets this signal . “None of our current cell phones have this,” says Thiago Ribeiro Claro, coordinator of the degree in Technology for Internet Systems at the Senac University Center.

Unlike Wi-Fi, which uses radio signals for transmission, with a current limit of 867 Megabits per second, the Li-Fi works with non-visible light reaching much higher speeds. “As the technology is very new, several searches, looking for the best way to transmit data, are occurring. Until last year the speed record was 10Gbps, which would already be much faster than Wi-Fi, “explains the coordinator. “This year, Oxford researchers were able to transmit data at 224 gigabits per second. This would allow 18 movies to be downloaded in 1 second. It is difficult to predict what the speed of this technology will be when it becomes a commercial product available, because that still depends on the standards that will be adopted, but it will certainly be much faster than Wi-Fi, “says the expert.

Another advantage of Li-fi lies in the security of data transmission, because the light does not cross walls, making it difficult for intruders to access. In addition, with the lamps sending signals to the cell phone inside a closed environment, it is possible to know precisely its positioning. “For example, a supermarket with Li-Fi may offer an app where you search for a product and the app displays an accurate map indicating how to get to the correct shelf. Malls, airports and major events can also enjoy this, “says Thiago Claro.

For now, Li-Fi only works well indoors. According to the coordinator, Li-fi technology would be best used if it were to complement Wi-Fi. “In a company that replaces Wi-Fi with Li-Fi, the phone would be completely disconnected from the network if it was placed in a pocket or drawer,” he explains.

Although promising, this technology is still in research. There is, therefore, a long way to go before it can be adopted as a standard by the market.

The 10 most popular social networks of 2015

Social networks and their message applications are more popular than ever, but which ones are the most popular?

We rank the platforms with the most active monthly users and although the list includes those which are no surprise, some relatively unknown services have entered the list.

Facebook owns and operates four of the six most popular social networks in the world. Only two other services, both of China’s Tencent, entered the competition. Check the list below.


Facebook was the first social network to exceed 1 billion members and closed the third quarter of 2015 with 1.55 billion monthly active users, including 1.39 billion in mobile devices.

The number of daily active users is also impressive, with 1.01 billion active users per day at the end of the third quarter, including 894 million in mobile only.


WhatsApp remains true to its original mission of building a simple message app that works across all mobile platforms and has changed little since its launch in 2009.

The application surpassed 900 million monthly users in early September, according to a post by co-founder and CEO of the company Jan Koum on Facebook. When the co-founded company by Mark Zuckerberg acquired the application for $ 21.8 billion in February 2014, WhatsApp had 450 million monthly active users.

Tencent QQ

The Tencent QQ messaging application, commonly known as “QQ” or “QZone”, had 860 million monthly users by the end of the third quarter of 2015. The Chinese company Tencent Holdings Limited owns and operates the service and most users of the platform resides in China and other Asian countries. QQ was released in early 1999 as an IM app (Instant Messenger).

Facebook Messenger

Facebook’s stand-alone messaging application was released in August 2011, but it was unsuccessful until the company “forced” its users to download the dedicated application in 2014.

According to co-founder Mark Zuckerberg, Facebook Messenger had 700 million users in early June, with 100 million of them adopting the service within 10 weeks of their CEO’s announcement.


Another Chinese Tencent app reported 650 million monthly users by the end of the third quarter of 2015. About 11% of WeChat users were located outside of China by the end of the second quarter. The tool became available in 2011, and currently earns around 10 million new users each month.


When Facebook acquired Instagram for $ 1 billion in April 2012, the image-sharing application had about 27 million total users registered. Instagram then announced that it had surpassed 400 million monthly users by September 2015 and that 100 million of them have embraced the service for the nine months following the announcement. Currently, the app earns around 10 million new users every month.


Twitter has been criticized for its low user growth in recent days, but it remains one of the most used social networks on the planet. The company closed the third quarter of 2015 with 320 million monthly users and 80% of them accessed the service at least once a month on mobile devices, according to the company.


The messaging service created in Japan expects to have more than 700 million registered users by the end of this year. Line reported that it had 212 million monthly active users in September 2015. In 2011, 15 engineers working for Korean search provider Naveer developed the app and although it has since become a separate service, Line remains a subsidiary of Naveer.

Sina Weibo

One of the most popular sites in China is kind of a mix between Facebook and Twitter. By the end of the first half of that year, the company said it had 212 million monthly active users, which represented an increase of 36% over the previous year. Mobile users made 85% of the company’s total users by June 2015, according to the company. Sina Weibo reached an average of 93 million users per day in the same month.


The network of image reference sharing exceeded 100 million monthly users in September, according to a New York Times article, the digital clipping album also continues to additional additional mechanisms for purchase and advertising.

How to choose the company that will develop my site?

Let’s identify some steps that you should evaluate?

1. Portfolio and References

A consolidated company has a diversified portfolio of portfolio, see if the company presents this, be wary if your customers are very specific.

Good relationships with your customers is essential. Get in touch with your customers and see what they say about the company that did the service.

– Quality of Service – assess aspects such as pro-activity, availability and technical knowledge of the area;

– Deadlines for delivery of layouts, programming and contents;

– Maintenance support – if the contact is easy, if the maintenance is done within the established deadlines;

– Return on investment – whether the site is bringing potential new customers or not;

– Pre-Project / Budget

2. Team

A business that’s developing must have people with skills at least:

– In Requirements Analysis, that professional who together with you will help to organize the ideas and build the site;

– In design (responsible for creating the layout) that will transform your ideas into something visual;

– In programming you will build the tool that you will use;

– Organization and posting of content;

– Support, that contact that will probably train you to use the tool at the end of construction and that will be your help when you have questions or need to resolve some nonconformity.

3 Company Posture

Always evaluate companies that give you a value as soon as “face” without really identifying what you want or need. Without presenting you with a pre-project or a document containing the main points discussed. Thus avoiding situations like: “I thought this or that was included … now I have to pay more?”

Remember that your website is your identity on the internet and that once available to your customers, can always be mentioned positively or negatively.

New Website Balancium Web

The new Balancium Web site should be released in October.


Completely new layout, brings the latest in technology for the creation of Websites.