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

Automatic Photocell Light Sensor Switch – Day & Night Control

Take the hassle out of manual switching with the HELTC DC Photocell Light Sensor Switch. This compact, reliable module automatically controls your lighting based on ambient light levels — turning your lights on at dusk and off at dawn, or vice versa. Perfect for street lights, garden lighting, security lights, solar setups, and any low-voltage DC lighting application.

Two Selectable Working Modes

• Night Mode: Light turns ON automatically when it gets dark and turns OFF during daylight hours — ideal for outdoor security and pathway lighting.
• Day Mode: Light turns ON automatically during the day and turns OFF at night — great for display lighting or daytime signage.

Key Specifications

• Working Voltage: DC 3.7V – 24V (compatible with 3.7V, 5V, 12V, and 24V systems)
• Maximum Current: 5A
• Recommended Load: Below 4A at 12V; below 2A at 24V
• Detection Range: 0 – 10 meters
• Default Sensing Delay: 30 seconds (prevents false triggering from brief light changes)
• Material: Durable plastic housing
• Package Includes: 1 × Light Sensor Switch module

Why You'll Love It

• ✅ Wide voltage compatibility — works across 3.7V to 24V DC systems
• ✅ Dual operating modes for flexible day or night automation
• ✅ Built-in 30-second delay prevents nuisance switching from passing headlights or brief shadows
• ✅ Compact and easy to integrate into existing wiring setups
• ✅ Energy-saving automation — lights only run when needed

Common Applications

• Street and pathway lighting automation
• Garden and landscape lighting
• Solar-powered lighting systems
• Security and porch lights
• DIY electronics and smart home projects

Made in Mainland China.

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For more information on electrical safety standards for low-voltage devices, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Photodetector

Frequently Asked Questions

Q: What voltage systems is this photocell light sensor switch compatible with?

A: This light sensor switch is compatible with DC systems ranging from 3.7V to 24V, including common 5V, 12V, and 24V setups. It works with a wide range of solar, battery-powered, and low-voltage lighting systems.

Q: What is the 30-second sensing delay for?

A: The built-in 30-second default delay prevents the switch from falsely triggering due to brief, temporary changes in light — such as passing car headlights or a momentary shadow. This ensures stable, reliable automatic operation.

Q: Can I use this switch for both day-on and night-on modes?

A: Yes! This sensor switch features two selectable modes: Night Mode (lights ON when dark, OFF during the day) and Day Mode (lights ON during the day, OFF at night). Simply configure it for your preferred automation needs.

Q: What is the maximum load current I should use at 24V?

A: While the switch is rated for up to 5A total, it is recommended to keep the load below 2A when operating at 24V, and below 4A at 12V, to ensure safe and reliable long-term performance.