DC 3.7V–24V 5A Photocell Light Sensor Switch | Auto On/Off

HELTC Automatic Photocell Light Sensor Switch – DC 3.7V to 24V, 5A

Take full control of your lighting—automatically. The HELTC DC Light Sensor Switch is a compact, reliable photocell module that turns your lights on or off based on ambient light levels. Whether you want street lights, garden lights, or project lighting to activate at dusk or dawn, this smart switch handles it all without manual input.

Two Selectable Working Modes

• Night Mode (Dark-ON): The light turns ON automatically when it gets dark and switches OFF during daylight — perfect for street lamps, pathway lights, and security lighting.
• Day Mode (Light-ON): The light turns ON automatically during the day and switches OFF at night — ideal for indoor grow lights, signage, or daytime indicators.

Key Specifications

• Working Voltage: DC 3.7V – 24V (compatible with 3.7V, 5V, 12V, and 24V systems)
• Max Current: 5A
• Recommended Load Current: ≤4A at 12V | ≤2A at 24V
• Detection Range: 0–10 meters
• Default Sensing Delay: 30 seconds
• Material: Durable Plastic Housing
• Package Contents: 1 x Light Sensor Switch Module

Why Choose This Light Sensor Switch?

• ✅ Wide voltage compatibility – works across a broad DC range (3.7V to 24V)
• ✅ Dual operating modes – night-on or day-on, switchable to suit your project
• ✅ Energy-efficient automation – eliminates the need for manual switching
• ✅ Compact & easy to install – fits into DIY electronics, solar systems, and outdoor lighting setups
• ✅ Built-in time delay – 30-second default sensing delay prevents false triggers

Ideal Applications

This photocell light sensor switch is great for street lights, garden and pathway lighting, solar-powered LED systems, DIY electronics projects, security lights, indoor grow lights, and more.

Made in Mainland China.

Please Note

Colors may appear slightly different on screen due to monitor brightness and lighting conditions. Please allow minor measurement tolerances for listed dimensions.

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External Resources

For guidance on electrical safety when working with low-voltage DC systems, visit the U.S. Consumer Product Safety Commission (CPSC) for product safety standards and best practices.

Learn more: Photodetector

Frequently Asked Questions

Q: What voltages does this light sensor switch support?

A: The HELTC photocell light sensor switch supports a wide DC voltage range of 3.7V to 24V, making it compatible with 3.7V, 5V, 12V, and 24V systems commonly used in DIY electronics and outdoor lighting projects.

Q: Can I use this switch for both day and night operation?

A: Yes! This switch features two selectable modes. In Night Mode (Dark-ON), the light activates when ambient light drops (at dusk) and turns off at dawn. In Day Mode (Light-ON), the light activates during daylight hours and turns off at night. You choose which mode suits your application.

Q: What is the maximum load current this switch can handle?

A: The switch is rated for a maximum of 5A. However, for safe operation, it is recommended to keep the load current at or below 4A when running at 12V, and at or below 2A when running at 24V to ensure longevity and reliable performance.

Q: What is the sensing delay and why does it matter?

A: The default sensing delay is 30 seconds. This built-in delay prevents the switch from toggling rapidly due to brief or temporary changes in light — such as a passing car's headlights — ensuring stable and reliable automated control of your lighting.