Zhaga specification for small LED spotlight modules

Important features of the specification include:

Scaled family of LED modules: Book 11 forms part of a scaled family of LED modules with different sizes. Book 3, which is already published, describes 50mm modules, while the forthcoming Book 10 describes 75mm modules. Furthermore, each of these books contains a set of categories defined by the diameter of the LES, ranging from 4.5 to 40mm.

Separate books for modules and drivers: Book 11 is unique in being the first Zhaga Book to describe an LED module, rather than a complete LED light engine. Luminaire makers will use independent LED drivers to provide power to the Book 11 modules. Zhaga has also defined specifications for such drivers and these will be included in the forthcoming Zhaga Book 13.

Driver-module interface: Book 11 is also the first Zhaga Book to contain a reference to the LEDset specification for the electrical interface between the Book 11 LED module and a suitable driver. This so-called driver module interface is essential to enable the independent interchangeability of different components. Zhaga has chosen to reference the LEDset specification developed by MD-SIG, rather than write a new specification

The circular LED modules in Book 11 have a diameter of 35mm and a height of 3.5mm. Three categories of LES size are defined, with diameters ranging from 4.5 to 13.5mm. Two LED modules with the same LES category should produce comparable photometric properties when either one of them is used in the same luminaire. A Book 11 LED module is typically mounted into a luminaire using M3 screws and the module has screw holes such that the screws that do not protrude above the top surface. Apart from these screw holes and other optional recessed features, the top surface of the Book 11 LED module is essentially flat and is intended to be used as the optics contact area.

Book 11 has 3 LES categories, with maximum LES diameters of 6.3, 9.0 and 13.5mm.