1. Product Overview
The Steinel NightmatIQ Twilight Switch is designed for automatic control of outdoor lighting based on ambient light levels. It offers a discreet, flat, and linear design, ensuring reliable operation in various outdoor environments.
This device automatically activates connected luminaires when the ambient light falls below a user-defined threshold and deactivates them at dawn. It is suitable for converting existing manual lighting systems to automatic operation.

Image 1.1: Front view of the Steinel NightmatIQ Twilight Switch.

Image 1.2: Illustration of automatic lighting operation: light on when dark, light off when bright.
2. Safety Instructions
Please read these instructions carefully before installing or operating the device. Failure to follow these instructions may result in property damage, personal injury, or death.
- Electrical Installation: Installation must be carried out by a qualified electrician in accordance with national wiring regulations and local electrical codes.
- Power Disconnection: Always disconnect the power supply before performing any work on the device.
- Voltage: Ensure the power supply voltage matches the device's specifications (220-240V).
- Protection: The device is rated IP54 for protection against dust and splashing water. Ensure proper sealing during installation to maintain this rating.
- Modifications: Do not modify the device in any way. Unauthorized modifications may void the warranty and pose safety risks.
3. Setup and Installation
The NightmatIQ Twilight Switch is designed for wall mounting. The cable connection can be either recessed or surface-mounted.
3.1 Package Contents
- Steinel NightmatIQ Twilight Switch
- Mounting material (2x screws, 2x dowels, 2x sealing plugs)
3.2 Mounting Location
Choose a mounting location that is exposed to natural ambient light and not directly affected by artificial light sources (e.g., streetlights, other lamps) that could interfere with its operation. Avoid locations where the sensor could be obstructed by objects or foliage.

Image 3.1: The NightmatIQ Twilight Switch installed on an exterior wall.
3.3 Installation Steps
- Disconnect Power: Ensure the main power supply to the installation area is switched off at the circuit breaker.
- Mark Drilling Points: Use the device or mounting plate as a template to mark the drilling points on the wall. Refer to the dimensions diagram for precise measurements.
- Drill Holes: Drill holes at the marked points and insert the provided dowels.
- Wire Connection: Connect the electrical wires to the terminal block inside the device. Ensure correct polarity and secure connections. It is recommended to consult a qualified electrician for wiring to ensure safety and proper function, especially for in-line installations.
- Mount Device: Secure the device to the wall using the provided screws. Ensure the sealing plugs are correctly used to maintain the IP54 rating.
- Restore Power: Once installation is complete and all connections are secure, restore power to the circuit.

Image 3.2: Dimensions of the NightmatIQ Twilight Switch (in mm).
4. Operating Instructions
The NightmatIQ Twilight Switch operates automatically once installed and configured.
4.1 Automatic Light Control
The device continuously monitors the ambient light level. When the light level drops below the set twilight threshold, the connected lighting fixtures will automatically turn on. When the ambient light level rises above the threshold (e.g., at dawn), the lighting fixtures will automatically turn off.
4.2 Adjusting the Twilight Threshold
The twilight threshold, which determines when the lights turn on and off, can be adjusted using a potentiometer (regulator) on the device. This allows you to set the desired brightness level between 1 and 75 lux.
- Lower Lux Setting (e.g., 1 lux): Lights will turn on only when it is very dark.
- Higher Lux Setting (e.g., 75 lux): Lights will turn on when it is still relatively bright (e.g., overcast day, early dusk).
To adjust, carefully open the device cover (if applicable) and locate the potentiometer. Turn it clockwise to increase the lux threshold (lights turn on earlier) or counter-clockwise to decrease it (lights turn on later).

Image 4.1: Key features of the NightmatIQ Twilight Switch.
5. Maintenance
The Steinel NightmatIQ Twilight Switch is designed for minimal maintenance due to its robust construction and IP54 rating.
- Cleaning: Periodically clean the sensor surface with a soft, damp cloth to remove any dirt, dust, or debris that might obstruct the light sensor. Do not use abrasive cleaners or solvents.
- Inspection: Regularly inspect the device for any signs of damage, loose connections, or wear. If any issues are found, disconnect power and consult a qualified electrician.
6. Troubleshooting
If you experience issues with your NightmatIQ Twilight Switch, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Lights do not turn on at dusk. |
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| Lights do not turn off at dawn. |
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| Lights flicker or behave erratically. |
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7. Specifications
| Feature | Specification |
|---|---|
| Brand | Steinel |
| Model Number | 066147 |
| Dimensions (L x W x H) | 3.8 x 9.5 x 9.5 cm |
| Weight | 128 grams |
| IP Rating | IP54 (Protection against dust and splashing water) |
| Voltage | 220-240 V / 50-60 Hz |
| Maximum Wattage | 1000 W (incandescent), 250 W (LED) |
| Twilight Threshold | 1 - 75 lux (adjustable) |
| Material | Plastic |
| Installation Type | Wall mount |
| Special Features | Waterproof |
8. Warranty and Support
8.1 Manufacturer's Warranty
This Steinel NightmatIQ Twilight Switch comes with a 3-year manufacturer's warranty. Please refer to the specific warranty conditions provided in the product packaging or on the official Steinel website for full details.
8.2 Customer Support
For technical assistance, warranty claims, or further information, please visit the official Steinel website or contact their customer service department. Contact details can typically be found on the product packaging or on the brand's website.
You can find more information about Steinel products and support at: Steinel Brand Store







