Light sensor Steinel Light Sensor Dual DALI2 AP square — Steinel ST057411

The Steinel Light Sensor Dual DALI2 AP square is a compact ceiling- or panel-mount ambient light sensor designed for integration with DALI-2 lighting control systems. It measures real-time illuminance and supplies an input signal for daylight harvesting and automatic dimming in interiors. The sensor's square design and low-profile housing make it suitable for discreet installation in offices, corridors, classrooms and commercial spaces where automated, energy-efficient lighting control is required.

Advantages

This light sensor offers accurate ambient light measurement compatible with DALI-2 control architectures, enabling smooth daylight-dependent dimming and scene control. The square, flush-mount form factor simplifies installation in modular ceilings or panels while maintaining a minimal visual footprint. Designed for indoor use, it supports energy savings by reducing artificial lighting when sufficient daylight is present and contributes to compliance with lighting control strategies in modern buildings.

Suitable for

• Daylight harvesting and automatic dimming in open-plan offices
• Corridors, stairwells and circulation areas requiring constant light-level control
• Classrooms, meeting rooms and training areas with variable daylight
• Commercial interiors and retail spaces integrated with DALI-2 systems

Key specifications

• Sensing function: ambient light (illuminance) measurement for control input
• Control compatibility: DALI-2 system integration for dimming and scene control
• Form factor: square, low-profile housing suitable for ceiling or panel mounting
• Installation location: indoor use for offices, classrooms and commercial spaces
• Output behavior: provides signal for automated daylight-dependent dimming and scene adjustments

How to use

Mount the sensor in a suitable indoor ceiling or panel location where it has a clear view of ambient light without obstruction from luminaires or interior fittings. Connect the device to the DALI-2 lighting network following the system wiring and addressing procedures. Configure the sensor parameters and DALI-2 control scenes through the building control software or DALI gateway to set target illuminance levels, dimming response and priority settings. After commissioning, verify that the sensor responds to changing daylight and that dimming curves meet the required comfort and energy targets.

Usage recommendations

Position the sensor away from direct glare or localized artificial light sources to ensure accurate ambient light readings. During commissioning, calibrate target lux levels for the intended use areas and test transitions between daylight and electric lighting to avoid abrupt changes in brightness.