Skip to main content
MJ
Md Jony Islam
Last updated: Jun 10, 2026

Day Night Light Sensor Switch Circuit

Learn how to wire a day night light sensor switch for automatic lighting control. Save energy and improve convenience with this simple guide and diagram.

Advertisement
Advertisement

Components List

Single phase Light

Single Phase LED Light

Energy-efficient LED light for single-phase supply

Single phase Light

Well Light Holder

Recessed light holder typically used in ceilings/walls

Single Phase DP MCB

Single Phase DP MCB

Double Pole Miniature Circuit Breaker for single-phase supply

Single Phase Contactor

Single Phase Contactor

Electromagnetic switch designed for controlling single-phase electrical loads

Day-Night Sensor

Day-Night Sensor

Light-sensitive switch that turns circuits on/off based on ambient light

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Advertisement

Day Night Light Sensor Switch Circuit

Learn how to wire a day night light sensor switch for automatic lighting control. Save energy and improve convenience with this simple guide and diagram.

Advertisement

electrical wiring single phase

A smart device is a day-night light sensor switch that switches the lights on at night and off during the day. It deploys a photoelectric sensor to monitor the relative brightness, which best suits the application of outdoor, street, and garden lighting. Light automation helps save energy as well as encouraging more safety: lights not used are turned off. Connection of the live and neutral wires to the input terminals of the sensor and the output to the light fitting is performed during installation. In the majority of the units, one can adjust at lux level to regulate the switching of the lights on or off depending on the light intensity. Modeled weatherproof can be used outside.

Formula & Table Summary:

Light Control Logic:

If Ambient_Light < Lux_Setting → Light_ON; else Light_OFF

Sponsored

day night sensor wiring diagram

A day light night switch is an intelligent switch that switches lights during the night and off during the daylight. It has the capability of sensing the brightness around it with the use of a photoelectric sensor, which makes it suitable in outdoor lighting, street, and garden lighting. Automation of light control will help curb energy waste and safety by making the lights active only when they are identified to be in use. Installation is done by connecting the live and the neutral wire to the input posts of the sensor and witting up the output terminal to the light fitting. The majority of the units can adjust to lux levels to turn on and off lights according to brightness. Outdoor consumption should be achieved by weatherproof models.

automatic light switch circuit

Lux Setting Approx. Time On Use Case
10 Lux Dusk Street lighting
30 Lux Early Evening Garden lights
50 Lux Cloudy Day Porch lighting
Advertisement

Frequently Asked Questions - Day Night Light Sensor Switch Circuit:

A device that turns lights on at night and off in daylight using a light sensor.
It detects ambient light levels and switches the connected load accordingly.
Yes, most models are compatible with LED lighting systems.
Many models do, but two-wire versions are also available.
In a location with clear natural light exposure but shielded from artificial light.
Yes, most units have an adjustable lux setting.
If unsure, hire a certified electrician to ensure safety and compliance.
Commonly 110V–240V AC, check product specifications.
Yes, if the sensor is rated for outdoor use.
Yes, it prevents lights from staying on unnecessarily during daylight.
Advertisement
Advertisement
Advertisement