XH-M131 DC 12V Light Control Switch
R 39.00R 69.00Save R 30.00
In Stock — 95 available

💡 XH-M131 — DC 12V Light Control Switch (Photosensitive Relay Module)

Automatically switch devices on or off based on ambient light levels. This compact photosensitive relay module uses a photoresistor probe (±150 mm lead) with an adjustable sensitivity potentiometer to trigger a built-in 12V relay (10A / 250V AC or 30V DC). Ideal for DIY dusk-to-dawn lighting, security lights, garden automation, and gate lighting projects. MPN: XH-M131.

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Free Delivery
Orders over R2,500
🇿🇦
Local Stock
Ships from Gauteng
💰
Only R39
Budget DIY
⚡
10A Relay
250V AC / 30V DC

⚡ Key Features

  • Photoresistor Light Detection — external probe (±150 mm lead) detects ambient light levels and triggers the relay when brightness crosses the set threshold
  • Adjustable Threshold — onboard potentiometer lets you fine-tune the light/dark trigger point for your specific installation
  • 12V DC Input — powered by any 12V DC source (power supply, battery, solar system, gate motor battery, etc.)
  • 10A Relay Output — switches loads up to 10A at 250V AC or 30V DC — handles lights, motors, pumps, and more
  • Normally Closed (NC) Relay — relay defaults to closed; opens when light threshold is met (or configure via wiring for your logic)
  • LED Status Indicators — red LED = power on, blue LED = relay active
  • Ultra-Compact — 31 × 53 × 16.5 mm, only 20 g — fits anywhere

🏠 Perfect For

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Dusk-to-Dawn Lighting

Automatically turn on driveway, garden, or security lights at sunset and off at sunrise. No smart home system needed — pure hardware automation.

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Gate & Driveway Lights

Power from the gate motor's 12V battery. Light turns on when it gets dark — perfect for illuminating the entrance when you arrive home.

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Greenhouse & Garden

Trigger supplemental grow lights when natural light drops below a set level. Pair with a timer for full day/night lighting schedules.

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DIY & Maker Projects

Use as a light-triggered relay in any 12V project: display cases, aquarium lighting, decorative lighting, alarm systems, or sensor-based automation.

💡 Pair with a smart gate controller: Use the XH-M131 for automatic gate lighting powered by your gate motor's 12V battery. Add a SONOFF MINI-D or eWeLink SV Inching Switch for smart gate control from your phone — a complete smart entrance setup.

🚗 Gate & Garage Controllers

Matter · Dry Contact · AC/DC · Gate/Garage

SONOFF MINI-D Smart Switch

Matter-certified dry contact switch for gates, garage doors, and boilers. AC 100–240V or DC 12–48V input. NO/NC/COM terminals. Inching mode for pulse triggers. R289.

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WiFi · Inching · DC 5–24V · Gate/Garage

eWeLink SV Inching WiFi Switch

DC 5–24V WiFi switch with inching (momentary pulse) and self-locking modes. Ideal for gate motors, garage openers, and low-voltage automation. R179.

View Product →

📋 Technical Specifications

Product XH-M131 DC 12V Light Control Switch
MPN / Model XH-M131
Type Photosensitive Relay Module
Input Voltage DC 12V
Relay Load 10A / 250V AC or 30V DC
Relay Type Normally Closed (NC)
Sensor Photoresistor (LDR) on ±150 mm lead cable
Threshold Adjustment Onboard potentiometer (variable)
LED Indicators Red = power on · Blue = relay active
Dimensions 31 × 53 × 16.5 mm
Weight 20 g
Package Contents 1 × Photosensitive relay module · 1 × Probe cable
Warranty 1 Year Manufacturer Warranty

❓ Frequently Asked Questions

How do I adjust the light sensitivity?
Turn the onboard potentiometer (small screw on the PCB) with a small flathead screwdriver. Clockwise = less sensitive (needs darker conditions to trigger). Counter-clockwise = more sensitive (triggers at higher light levels). Test by covering the photoresistor with your hand and adjusting until the relay clicks at your desired light level.
Can I power it from my gate motor battery?
Yes. Most SA gate motors have a 12V backup battery. You can tap into this to power the XH-M131 module, and use its relay output to switch a 12V gate light or LED strip. The module draws very little current.
Can it switch 220V mains lights?
Yes — the relay is rated for 10A at 250V AC. You can use it to switch mains-powered lights, but ensure all mains wiring is done by a qualified electrician and the module is housed in an appropriate enclosure.
Is this a smart / WiFi device?
No. The XH-M131 is a simple hardware relay module — no WiFi, no app, no smart home integration. It triggers purely based on ambient light. For smart gate/light control via your phone, see the SONOFF MINI-D or eWeLink SV Inching Switch.

🤝 Need Help? We're Here for You!

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Call Us

Jesse: 071 678 8719
Jason: 084 505 7481

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Visit Us

8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709

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Email

info@eiferer.co.za

Automatic Lighting. Simple. Affordable.

12V light-triggered relay — dusk-to-dawn automation for just R39.