Table of Contents
Introduction to LiFi and WiFi
LiFi transmits data through light (LED flicker), offering very high potential speeds and no radio interference, but it needs line-of-sight and can’t pass through walls. WiFi uses radio waves, so it has longer range, works through walls, and remains the widely deployed standard. LiFi is best for secure, high-density indoor use; WiFi wins for general mobility and coverage.
If you’re not satisfied with how your WiFi network works, be relieved to know that there’s a new innovation called LiFi will shortly overpower normal WiFi speed. Introducing the LiFi, a new technology that is 10 to 100 times faster than the WiFi.
Now that we know LiFi will be big threat to WiFi technology , its important that we know how both are different and each outshines the other . We as users will feel the new LiFi Technology conquering the world with its state of art technology and underpinning features.
What is LiFi?
LiFi (Light Fidelity) is a wireless communication technology that uses visible light—typically from LED bulbs—to transmit data, instead of radio waves like WiFi. It works by rapidly flickering LEDs (imperceptible to the human eye) to encode data, which a photodetector on the receiving device picks up and decodes.
Key Characteristics
- Speed: Can theoretically reach multi-Gbps speeds, since visible light has a much larger spectrum than radio frequencies.
- Range/line-of-sight: Limited to the area lit by the source and doesn’t pass through walls or opaque objects—this makes it inherently more secure (signal can’t be intercepted from outside a room) but restricts mobility.
- No RF interference: Safe for use in places where radio signals are restricted, like hospitals, aircraft, or sensitive industrial environments.
Use Cases
Indoor high-density environments, secure facilities, underwater communication (where RF doesn’t travel well), and as a complement to WiFi rather than a full replacement.
It was coined by Professor Harald Haas around 2011 and is standardized under IEEE 802.11bb.
What is WiFi?
WiFi (Wireless Fidelity) is a wireless networking technology that uses radio waves to connect devices—laptops, phones, routers—to a local network and the internet, without physical cables.
Key Characteristics
- How it works: A router transmits and receives data over radio frequency bands, most commonly 2.4 GHz and 5 GHz, with 6 GHz added in newer standards.
- Standards: Governed by the IEEE 802.11 family (e.g., 802.11n, ac, ax/WiFi 6, and the newer WiFi 7/802.11be), each generation improving speed, range, and efficiency.
- Range: Typically covers 30–50 meters indoors, penetrating walls and floors reasonably well, though with some signal loss.
- Speed: Modern WiFi 6/6E/7 routers can deliver multi-Gbps speeds under ideal conditions.
Use Cases
The default wireless standard for homes, offices, and public spaces—supports mobility, multiple simultaneous device connections, and broad interoperability across virtually all consumer electronics.
Its main trade-offs compared to newer tech like LiFi are potential interference from other RF devices and comparatively higher security exposure, since radio signals can pass through walls and be intercepted from outside a room.
Comparison Table: LiFi vs WiFi
Lets see the table below to compare on various features and parameters –
| FEATURE / PARAMETER | LI-FI | WI-FI |
|---|---|---|
| Technology | IrDA compliant devices | WLAN 802.11a/b/g/n/ac/ad standard |
| Operating Frequency | 10,000 times frequency spectrum of radio | 2.4 GHz , 4.9 GHz and 5 GHz |
| Coverage | Around 10 meters | Around 32 meters and varies on power /antennae type |
| Data Density | Works in high dense environment | Works in less dense environment |
| Privacy | Light is blocked by walls , hence more secured. | RF signal cant be blocked by walls , hence less secured |
| Data Tranfer Speed | Faster transfer speed (>1 Gbps) | Slower transfer speed (150 Mbps) |
| Medium of Data Transfer | Light as the carrier | Radio spectrum is carrier |
| Spectrum Range | Light has spectrum 10000 times broader than radio frequency | Radio frequency spectrum is much less than light spectrum |
| Cost | Cheaper than Wifi due to – 1 – No license required for light band 2 – Lower installation cost | Cheaper than Wifi due to – 1 – License required for radio band 2 – Higher installation cost |
| Ecological impact | Low | Medium |
| Market Maturity | Low | High |
| System components | Lamp driver, LED bulb (lamp) and photo detector will make up complete LiFi system. | requires routers to be installed, subscriber devices(laptops, PDAs, desktops) are referred as stations |
| Applications | Used in airlines, undersea explorations, operation theaters in the hospitals, office and home premises for data transfer and internet browsing | Used for internet browsing with the help of wifi kiosks or wifi hotspots |
| Merits(advantages) | Interference is less, can pass through salty sea water, works in densely region | Interference is more, can not pass through sea water, works in less densely region |
Download the comparison table lifi vs wifi
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Li-Fi Technology: The Next Big Thing
Future of Wireless Communication Technology
ABOUT THE AUTHOR
You can learn more about her on her linkedin profile – Rashmi Bhardwaj
