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The Zhaga Consortium, an international group of lighting industry companies, develops interface specifications (Books) that enable the interchangeability of LED light engines made by different manufacturers. Zhaga has published its second interface specification for LED light engines: Zhaga Interface Specification Book 2 defining a SSL module primarily for downlight applications. Zhaga has also created a database of certified products, which are all commercially available. In October 2012, Zhaga published Book 1 and Book 3, which respectively include common definitions and generic information applicable to all the different interface specifications.