What is the difference between Bluetooth and LiFi?

To begin with, let us learn about the concept of bluetooth.


Bluetooth is a proprietary open wireless technology which calculates for exchanging data over short locations (using short-wavelength radio channels in the ISM band from 2400-2480 MHz) from durable and mobile devices. It can generate personal area networks (PANs) with large levels of security. It was produced by telecoms vendor Ericsson in 1994, and it was initially accepted as a wireless approach to RS-232 data cables. It can connect multiple devices, overcoming problems of synchronization.

Bluetooth is managed by the Bluetooth Special Interest Group, which has more than 14,000 member organizations in telecommunication, calculating, networking, and used electronics.

Bluetooth is a packet-based protocol along with a master-slave mechanism. One master can connect with up to 7 slaves in a piconet and all devices share the master’s clock. Packet exchange based on the primary clock, defined by the master, which ticks at 312.5 μs intervals. Two clock ticks create a slot of 625 μs; two slots make up a slot combine of 1250 μs.

The core specification can define the Bluetooth protocol stack and the requirements for the testing and qualification procedure of the Bluetooth-based products. It can be used to describe physical and logical channels, voice or data link types, various packet formats, send and receive timing, channel control, and the structure for frequency hopping and device addressing.


Li-Fi represents light-fidelity. It is a networking technology that uses the visible spectrum instead of radio waves. The technology uses a standard LED light bulb to share data. The LED bulbs are appropriated with a chip that inflicts the light for optical data transmission which is received by photoreceptors.

A LiFi network uses the light from LED lamps to share data to a device, including a computer or tablet. The device has a receiver to choose light signals and a transmitter to transmit light signals back to the lamp using infrared light.

The light from the LED lamps changes intensity billions of times a second, quicker than the eye can view. This change in strength becomes a digital signal which can give data from the web to a user and uphold again.

The advantage of using the visible light spectrum (VLS) is that the spectrum is underused for wireless communication and provides several times the bandwidth available through the radio frequency spectrum.

The visible light spectrum, ranging from 428 THz to 750 THz, provides a capacity that is 10,000 times higher than the whole radio frequency spectrum and can decrease some of the pressures leading towards the Spectrum Crunch, particularly with the increased user demand for high-frequency bandwidth.

Updated on: 23-Nov-2021


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