When a Light Is More Than a Light:
Visible Light Communication (IEEE 802.15.7) and the Next Step in Smart Lighting

We are used to thinking of the LED as a tool for lighting or display. But the LED has an underrated ability: it can flicker fast enough to transmit data while the human eye notices nothing at all. When a single light illuminates, displays, and transmits information all at once, the very definition of a 'light' is rewritten. This article starts from the international standard for visible light communication and looks ahead to the next step of addressable LED in smart lighting and the IoT.

We are used to thinking of the LED as a tool for lighting or display. But the LED has an underrated ability: it can flicker fast enough to transmit data while the human eye notices nothing at all.

When a single light illuminates, displays, and transmits information all at once, the very definition of a “light” is rewritten. This article starts from the international standard for visible light communication and looks ahead to the next step of addressable LED in smart lighting and the IoT—a window into the long-term value of pixel-control technology.

Visible light communication: making light transmit data

Visible light communication (VLC) uses an LED’s fast modulation of light intensity to transmit data. The key insight is this: the human eye perceives only the average intensity of rapidly changing light, so an LED can transmit information at the same time, without affecting the lighting and with the eye noticing nothing^[1].

The international standard governing VLC is IEEE 802.15.7. It uses the visible spectrum (wavelengths of 390–750 nm, frequencies of 400–790 THz) and defines modulation schemes such as OOK (on-off keying), OFDM (orthogonal frequency-division multiplexing), and PAM (pulse-amplitude modulation)^[1]. VLC offers advantages such as high data rate, immunity to electromagnetic interference, license-free spectrum, and high reuse, and is seen as a strong complement to existing wireless communication, suiting scenarios like indoor positioning, short-to-medium-range communication, and vehicle networking.

Using the LED for both lighting and communication is a sustainable and energy-efficient approach^[1]—which echoes exactly the core proposition of smart lighting: letting the LED take on functions beyond lighting.

One shared idea: making the LED do more

VLC and PowerMOS’s power-line carrier pixel control are two different technologies, yet they share one core idea.

• Power-line carrier lets a power line transmit power and control signal at once—making a light addressable.
• VLC lets an LED’s light illuminate and transmit data at once—making a light able to communicate.

They represent two directions of smart lighting: the intelligence of control and the intelligence of communication. And the shared foundation of both is the ability to control an LED precisely and at high speed. Without that foundation, a light is just a light.

Addressability: the IoT idea expressed in lighting

Pull the view back, and the deeper meaning of addressable LED is bringing the IoT idea of “every device is a network node” to lighting.

Addressability lets every light become a node that can be individually addressed, controlled, and even report back. When lighting goes from “a light that turns on” to “a group of addressable, programmable light nodes,” it can carry display, interaction, sensing—and in the future even communication, becoming the infrastructure of a smart space. This is the through-line that recurs across this series: from motion capture to esports, from concerts to city beautification, the shared prerequisite of every application is that “every bead has its own address.”

The PowerMOS position: bead-level infrastructure

PowerMOS focuses on making every LED bead controllable precisely and at low cost—the common foundation of all smart lighting capabilities. From power-line carrier pixel control and the two-section address to automated production, the PowerMOS technology path is to push per-bead control to the extreme in cost and reliability, providing bead-level infrastructure for the many future forms of smart lighting.

Further reading: for the technical lineage of addressable lighting, see The Two-Wire Question in Addressable Lighting; for the current applications of real-time interaction, see the full Technical Insights series. To control every bead with your own hands, try the bead simulator and control each one.

References

1. IEEE Std 802.15.7-2011, IEEE Standard for Local and Metropolitan Area Networks — Part 15.7: Short-Range Wireless Optical Communication Using Visible Light. IEEE Standards Association.
2. IEEE Std 1901.2-2013, IEEE Standard for Low-Frequency Narrowband Power Line Communications for Smart Grid Applications. IEEE Standards Association — reference for the technical scope of power-line carrier.
3. IEC 62386, Digital Addressable Lighting Interface (DALI). International Electrotechnical Commission.

This article is an educational piece on technology trends. The names and numbers of the standards cited can be verified in the official catalogs of the IEEE Standards Association and IEC. PowerMOS pixel-control ICs use a proprietary carrier protocol optimized for LED pixel control and are not an implementation of the above standards.

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