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This system compensates for the depreciation of luminous flux to avoid excess lighting at the beginning of the installation’s service life. Luminous depreciation over time must be taken into account to ensure a predefined lighting level during the luminaire’s useful life.

Without a CLO feature, this simply means increasing the initial power upon installation in order to make up for luminous depreciation. By precisely controlling the luminous flux,the energy needed to reach the required level can be maintained throughout the luminaire’s life.

1.Standard lighting level | 2. LED lighting consumption with CLO | 3. Energy savings

By taking care of control and power requirements, D4i makes it much easier to mount sensors and communication devices on luminaires. In addition, intelligent D4i LED drivers inside the luminaire have the capability to store and report a wide range of luminaire, energy and diagnostics data in a standardized format.

Smart D4i luminaires are ideal platforms for the IoT, capable of gathering information from on-board D4i sensors, and providing data for performance monitoring, asset management, predictive maintenance and many other tasks. Communication and data exchange with an external network can take place via a D4i control device with wireless communication capabilities.

D4i is an extension of the DALI-2 certification program. D4i LED drivers have a mandatory set of features related to power-supply requirements and smart-data capabilities.

The MidNight function feature allows an autonomous dimming

without the need for an additional control line. The output levels

can be set to 0% (OFF) or between 10% and 100% in steps of 1%

Time-based: The dimming profile defined in the reference

schedule is referenced to the switchon time of the LED driver.

Astro-based: The dimming profile defined in the reference

schedule is referenced to the annual average middle of the

night, which is calculated based on the theoretical sunrise and

sunset times.

A. Dimming level |B. Time

The luminaire can be equipped with a standardized Zhaga-D4i socket, offering:

- Easy installation and replacement of sensors and controllers without opening the luminaire
- Support for smart features and data collection thanks to D4i technology
- Future-proof upgrade potential for smart solutions
- Compatibility with a wide range of devices from various manufacturers
- Potential for integration into smart city systems and IoT networks

The Zhaga-D4i socket represents a flexible and future-ready solution for modern lighting systems.

The luminaire can be equipped with a standardized NEMA socket, offering:

- Universal interface for connecting various control devices and sensors

- Easy installation and replacement of components without interfering with the luminaire

- Support for advanced lighting control functions and data collection

- Compatibility with a wide range of devices from various manufacturers

- Potential for upgrading to smart solutions in the future

- Suitability for integration into smart city systems and IoT networks


The NEMA socket represents a proven and flexible solution for modern lighting systems, allowing for easy expansion of luminaire functionality.