LED Professional Review - Zhaga Special Issue
The September/October 2015 issue of LED Professional Review features a series of technical articles written by Zhaga experts.
Download the full set of articles (PDF file)
With new specifications covering COB LED arrays, LED drivers, and other LED modules and light engines, Zhaga is making rapid progress in standardizing these types of component in response to the needs of the market. Musa Unmehopa, Secretary General of the Zhaga Consortium, and Tim Whitaker, Director of Marketing Communications, describe how Zhaga is evolving and changing its focus in a number of areas.
In order to address the complexity of dealing with a wide range of Chip-on-board (COB) LED modules, the Zhaga Consortium has standardized a family of form-factors in its new specification, Book 12. Martin Creusen and Charles Knibbeler from Philips Lighting, Manfred Scheubeck from OSRAM Opto Semiconductors, Ingo Arnrich from BJB and Nico van Stiphout from Molex discuss the numerous issues that have been addressed by Zhaga, leading to a mechanical interface specification for these components.
Enabling LED modules and LED drivers to be fully interchangeable at the component level requires a specification for the electrical interface between the driver and module (DMI). Arnulf Rupp of OSRAM GmbH, a member of both the Zhaga Consortium and MD-SIG, explains the role of both organizations in developing and implementing a consistent, easy to use, cross-vendor DMI specification.
The concept of the light-emitting surface (LES) has been developed by the Zhaga Consortium to enable comparisons of the photometric properties of different LED light engines. Stefan Lorenz, a Systems Architect with OSRAM GmbH, describes the theory behind the LES and how it applies to the different Zhaga Books.
Thermal fit is an essential aspect of determining if LED light engines and luminaires are compatible with each other. Zhaga specifications include a standardized data set to enable users to perform an easy check of the thermal fit conditions, as explained by Uli Mathis from Tridonic and Toine Staring from Philips Lighting.