Zhaga publishes Book 11 for 35-mm spotlight LED modules

Oct. 12, 2015
The new Zhaga book is the first to only define an LED module and also the first to reference the driver interface that has been defined by the Module-Driver Interface – Special Interest Group (MD-SIG).

The new Zhaga book is the first to only define an LED module and also the first to reference the driver interface that has been defined by the Module-Driver Interface – Special Interest Group (MD-SIG).

The Zhaga Consortium has announced publication of Book 11 covering 35-mm-diameter LED modules intended for applications such as spotlights and similar luminaires. Book 11 becomes a part of a set of related specifications for round modules with Book 3 describing 50-mm modules and Book 10 describing 75-mm modules.

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Zhaga is an industry organization that is seeking to simplify the supply chain for solid-state lighting (SSL) manufacturers by establishing standards for interchangeable LED light engines (LLEs). The organization refers to its specifications as Books and defines different Books for specific applications. Book 3, for example, was the first Book published for spotlights.

While Book 11, 3, and 10 all define a fixed mechanical size for LED modules, the Books also offer options in terms of the size of the light-emitting surface (LES) or source size characterized by category. Book 11 includes LES 6.3 (4.5 to 6.3 mm), LES 9 (6.3 to 9 mm), and LES 13.5 (9 to 13.5 mm).

Book 11 differs in two ways from the earlier Zhaga books. The organization said it is the first Book "to describe an LED module, rather than a complete LED light engine." That is a subtle distinction because Book 3 and Book 10 both require an external driver, or what Zhaga calls electronic control gear (ECG), to combine with an LED module to compose an LLE. Book 3 and 10 define the required ECG via references to form factors.

Related article: Zhaga Consortium publishes Book 9 specification for LED light engines

Modules defined by Book 11 will also require an external ECG, but Book 11 doesn’t specifically cover drivers. Zhaga is also working on a new Book 13 that will define drivers that can be used with Book 11 modules. And developers working with Book 11 can rely on the drivers defined in Book 1 while Book 13 is under development.

Related article: Zhaga plans a new interchangeable-source Book including COB LEDs

Book 11, meanwhile, is also the first Zhaga Book to require that the modules comply with the LEDset specification that has been developed by another industry organization, the Module-Driver Interface – Special Interest Group (MD-SIG). Member of the MD-SIG include BAG, Helvar, Osram, Panasonic/Vossloh Schwabe, Philips, TCI, and Zumtobel/Tridonic. The LEDset specification defines the electrical interface between the driver and module, including the ability to set the current level produced by the driver either by an external current-set resistor or a resistor that can be optionally integrated in the module.

About the Author

Maury Wright | Editor in Chief

Maury Wright is an electronics engineer turned technology journalist, who has focused specifically on the LED & Lighting industry for the past decade. Wright first wrote for LEDs Magazine as a contractor in 2010, and took over as Editor-in-Chief in 2012. He has broad experience in technology areas ranging from microprocessors to digital media to wireless networks that he gained over 30 years in the trade press. Wright has experience running global editorial operations, such as during his tenure as worldwide editorial director of EDN Magazine, and has been instrumental in launching publication websites going back to the earliest days of the Internet. Wright has won numerous industry awards, including multiple ASBPE national awards for B2B journalism excellence, and has received finalist recognition for LEDs Magazine in the FOLIO Eddie Awards. He received a BS in electrical engineering from Auburn University.