Zhaga has recently announced the release of two standards:
Book 21 (New):
Zhaga’s new Book 21 defines a standardized interface for linear socketable LED modules used in SELV (Safety Extra Low Voltage) luminaires, aiming to future‑proof product design and support circular economy goals. The specification covers electro‑mechanical, mechanical, electrical, thermal and photometrical interfaces so that LED modules from multiple vendors can be interchanged in the same luminaire without redesign.
Book 21 focuses on cost‑effective, toolless, plug‑and‑play replacement of linear LED modules, enabling serviceability and upgrades over a luminaire’s lifetime. This supports extended product lifecycles, easier maintenance, and reduced electronic waste by avoiding full luminaire replacement when performance, efficacy, or regulations change.
Book 21 enables specifiers, OEMs and maintenance organizations to design and maintain luminaires that remain adaptable to future LED generations and regulatory requirements. Book 21 also aligns with Zhaga’s broader mission to standardize interfaces across LED components, complementing other Zhaga Books and providing a clear certification path to ensure multi‑vendor interoperability. The Consortium highlights that certified components listed in the Zhaga database give the market confidence that Book 21‑compliant modules will operate reliably and interchangeably in compatible luminaires.
More information on Book 21 is available here.
Book 18 (Revised):
The Zhaga Consortium’s new Edition 4 of Book 18 expands its smart outdoor lighting interface standard to cover heritage and decorative luminaires while preserving backward compatibility with earlier editions. The update strengthens the Zhaga‑D4i ecosystem for plug‑and‑play connectivity between luminaires, sensors, and communication nodes in smart city and industrial applications.
Edition 4 introduces provisions for pole‑mounted bracket assemblies that allow one or two Zhaga interfaces, enabling smart controls to be added to traditionally styled fixtures with diverse form factors. It also addresses installation challenges by supporting longer cable runs between the luminaire and the bracket‑mounted control devices while maintaining robust power and data communication.
To enhance reliability and circularity, the specification clarifies surge‑protection functionality for these new configurations and reinforces interoperability within the joint Zhaga‑D4i certification program operated with the DALI Alliance. Cities and operators can now upgrade existing decorative and historical streetlights to connected, digitally managed assets without changing their visual appearance, supporting energy monitoring, diagnostics, and future sensor upgrades.
More information on Edition 4 of Book 18 is available here.
Both images courtesy of Zhaga Consortium.
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