WT41 Radar Chip Module for Smart Lighting Integratio

At night on a shopping street, projection lights cast brand logos onto the ground, telling a brand’s story through flowing light and shadow. But when ads shine 24 hours a day, who still looks at them? When the meter keeps running, who pays for the “ineffective exposure”?

From “tools” to “intelligent touchpoints” — the transformation of the lighting industry

Traditional projection lamps rely on light imaging principles. Compared with posters or billboards, they occupy less space and require lower maintenance, making them a popular choice for commercial promotion and atmosphere creation.

From residential corridors to shopping malls, from cafés to restaurants, projection lights have gained ground thanks to flexibility and visual impact. But in an age of information overload, static lighting easily fades into the background and is ignored. Continuous power consumption further increases long-term operating costs, eroding profit margins.

How to make ads come alive? How to ensure every watt is spent efficiently? These questions drive innovation.

The dilemma of traditional projection lamps

The principle is simple: power drives an LED light, which passes through lenses and patterned slides to project clear images on surfaces. This mature optical system supported the rise of projection advertising.

However, mature technology does not guarantee business success. Traditional lamps face two core pain points:

1. Ineffective advertising. Constant lighting may attract initial attention but soon blends into the background. When the same logo stays in the same spot for months, passersby stop noticing. Visual fatigue kills attention, the essence of advertising.
2. Hidden cost waste. Continuous operation raises electricity bills and accelerates component aging. Frequent replacements and maintenance increase operating costs.

The industry needs innovation—not in optics, but in redefining when lights should turn on.

Traditional projection vs. WT41 Smart Projection Solution

“WT41 Microwave Radar Chip—Empowering Smart Interaction”

The core idea is to give projection lamps “sensory nerves” and a “smart brain.”
By integrating the WT41 microwave radar module, the lamp shifts from passive display to active perception: light on when people come, off when they leave.

The WT41 series uses electromagnetic wave detection, penetrating non-metal materials for concealed installation in ceilings or walls. When motion is detected, the lamp turns on instantly; when the area is empty, it powers down into ultra-low standby mode.

Model	WT4101A-C01	WT4101A-C04L	WT4101A-C04	WT4101B-C04L	WT4101B-C05
PC Tool	Not supported	Not supported	Not supported	Supported	Supported
Dimensions	18mm × 12mm, thickness 1.6mm	19.5mm × 18mm, thickness 1.6mm	19.5mm × 18mm, thickness 1.6mm	20mm × 20mm, thickness 1.6mm	20mm × 20mm, thickness 1.6mm
Detection Range	0.5–2 meters	1–8 meters	1–13 meters	1–13 meters	1–30 meters
Power Consumption	Default 880μA, high-power mode	As low as 420μA	880μA, 9.6mA	As low as 10μA, default 24μA	8.6mA

WT4101 Series — 5 Microwave Radar Modules

The WT41 lineup offers flexible configuration. Detection ranges from 0.5 m to 30 m cover everything from children’s rooms to mall atriums. Adjustable range, power, and parameters via PC tool allow optimization for energy saving or fast response. The UART debug interface simplifies integration, keeping hardware cost reasonable.

The key lies not in complexity but in timing precision.
The instant shift from dark to bright creates strong visual contrast, greatly enhancing recognition and memory. When light changes dynamically with people’s movement, advertising impact multiplies.

Over 50% Energy Savings — A Complete Upgrade from Cost to Experience

1. Energy management revolution.
   Auto-off when vacant; standby current as low as 10 µA; only lights up when people are present. Saves over 50% electricity annually, cutting thousands in costs across multiple sites.
2. Extended equipment lifespan.
   Less idle time extends LED and electronic component life. Lamp replacement cycles increase from yearly to every 2–3 years, reducing material and labor costs.
3. Enhanced user experience.
   In hotels, the logo projection lights up as guests approach, creating a “lit because of you” ritual moment that boosts brand impression. In shopping areas, dynamic lights attract attention and increase dwell time.
4. Expanded application scenarios.
   Thanks to radar’s penetration of non-metal materials, sensors can be hidden behind ceilings, walls, or decorative panels—giving designers more freedom.

From malls, pedestrian streets, and retail entrances to hotels, cafés, restaurants, and children’s rooms, smart sensing projection lamps redefine how advertising is presented.

This is more than a product upgrade; it marks a digital shift for the lighting industry.

Traditional lamps deliver one-way information: always on, single-function, no interaction. Smart sensing lamps form a two-way system: detecting presence, responding to behavior, delivering information at the right time.

Microwave radar gives lighting the ability to “think.” It knows when to light up, when to dim, how to save energy, extend life, attract attention, and enhance experience.
This intelligence is not for show—it solves real business challenges: making advertising more effective, costs more controllable, and experiences more engaging.

In a world increasingly focused on sustainability, the energy-saving nature of smart sensing lamps aligns with green development. Reducing unnecessary lighting cuts carbon emissions and demonstrates corporate responsibility. For brands pursuing environmental progress, this is measurable, visible proof of action.

Say goodbye to ineffective display and embrace intelligent interaction.
With a single microwave radar chip, smart sensing projection lamps deliver comprehensive upgrades in advertising performance, cost control, and user experience.

“Light on when people come, off when they leave.”
Behind these eight words lies deep insight into timing, efficiency, and user experience—a vivid symbol of the lighting industry’s transformation toward intelligence and digitalization.

As projection lamps evolve from static background to dynamic focal point, and ads shine for people, not at them, the future of smart lighting is already here.