Wireless Fidelity (Wi-Fi) is known as one way to get connected to the Internet. Initially, Wi-Fi was created for the use of wireless devices and local area network (LAN). However, Wi-Fi now we can enjoy everywhere: restaurants, cafes, homes, offices, up to a certain area of ??open space. The more merakyatnya Internet network, the more the tower base transmition system (BTS) which should stand. At least, there are approximately 1.4 million base stations are standing on our earth. There are about 600 terabytes of total data base stations around the world through every month. On the other hand, there are about 14 billion light bulbs, emit light. Then what is the relationship between the internet and the light bulb? Here's the explanation. Harald Haas, a German physicist, found another way to connect the communication equipment, especially mobile phones, the Internet. And it uses a light bulb. You would know if the light is an electromagnetic wave, just like a cell phone or other transmitting device. Only, the wave on the light bulb using a visible light spectrum in the eye. This is what is being developed by Haas. Haas conducted the study called the D-light. This is a way for data transmission on the light-emitting diode (LED) can be optimized. The trick, performed using a data transmission technology index modulation subcarrier orthogonal frequency division multiplexing (OFDM SIM), with spatial modulation. Just imagine the television remote and the television itself. Remote has been done when the data transfer control to the television off, switch channels, set the sound, and others. The data transfer process occurs that is not too aware of. The bulb will be the data transmission device. A wireless device within range of the LED can transmit and receive data through the light. One advantage is the light bulb internet with a fast connection. Harald claims, each individual can reach speeds of more than 10 megabytes persecond (Mbps). In the shadow of Harald, all devices in the future (laptop, smartphone, tablet, etc.) can connect to the Internet by simply relying on sources of light, including light bulbs in the room.