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Book 15:

Rectangular LED modules for use with lens arrays

Book 15 defines a family of rectangular LED modules that are intended to be used with lenses or arrays of lenses (also known as lens plates).

The modules require a separate LED driver (electronic control gear), and usually will be mounted on a heat sink.

The specification defines several attributes of the LED modules, to enable accurate alignment with the lenses, but the lenses themselves are NOT defined in this specification.

Book 15 modules with lenses are typically used for outdoor lighting applications, including roadway, pathway and outdoor-area lighting.


For a short overview of Book 15, watch the video below or download the presentation (PDF file).


Book 15 defines the maximum outline (demarcation) of the LED modules, as well as the mounting-hole positions. In total there are six categories of module, with three different sizes, depending on the number of LEDs in the array (see Table).

Category Number of LEDs

LED pitch


Maximum width

of module (mm)

2x2-DA / DS 2 x 2 25.4 50
2x4-DA / DS 4 x 2 25.4 50
2x8-DA / DS 8 x 2 25.4 50

The modules have holes for alignment of the optics (lens arrays). Book 15 defines the position and size of these optical alignment features. The DA and DS categories differ by the quantity and position of alignment holes. The DA version is for a single lens array per module, while the DS version is for individual lenses (with possibly different characteristics) per LED.

Book 15 also defines the position of the light-emitting elements (i.e. the LEDs). Zhaga specifies the centre position of the light-emitting surface (LES) of these elements. Crucially, the size of the light-emitting elements is not restricted. For each module, the LED pitch is 25.4 mm.

Certified products

Zhaga members can certify products according to this Book, using various Authorized Test Labs.

Products that are certified according to each Book are listed in the Certified Products database.