Book 9

Zhaga Interface Specification Book 9 defines the interfaces of LED light engines (LLEs) comprising an LED module with a ring-shaped light-emitting surface (LES) and a separate LED driver (electronic control gear).

There are two LLE categories in Book 9, which are defined by the dimensions of the LES:

  • RL25 - LES ring with inner and outer diameter of approx. 20 and 30 mm, respectively
  • RL12 - LES ring with inner and outer diameter of approx. 7 and 17 mm, respectively

Book 9 modules could enable LED luminaire products for use in consumer lighting applications, such as small spotlights, track lighting and other compact luminaires.

This Book must be read together with Zhaga Interface Specification Book 1.

Publication status

Public downloads are available:

Download Book 9 (English) - Edition 1.0, April 2015

Download Book 9 (Chinese) - Edition 1.0, April 2015

The Zhaga Consortium will review and update this specification from time to time. To ensure you are aware of any updates to the Zhaga specifications, please subscribe to the Zhaga newsletter.

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.

More details

The LED modules defined in Book 9 are small in size, with a simple construction and a low profile (4 mm height). The light output is typically in the order of several hundred to around one thousand lumens.

These features mean that Book 9 LED light engines are highly suited for use in LED luminaires for consumer lighting applications, such as small spotlights, track lighting and other compact luminaires. However, Zhaga does not restrict the applications that can be addressed.

Book 9 contains two categories, which are defined according to the maximum size of the ring-shaped light-emitting surface (LES). The LES is an area of the module that is available for mounting the LEDs.

The RL25 category has an LES ring with inner and outer diameters of approx. 20 and 30 mm, respectively. For smaller modules in the RL12 category, these values are approx. 7 and 17 mm, respectively.

Each LED module has one or more optics contact areas (OCAs). An OCA is a surface with a defined shape and location for placement of the luminaire optics (reflectors, lenses etc).

The Zhaga specification also defines a demarcation boundary, which is the maximum area that the module can occupy. For the RL25 category, this boundary is a rectangular shape measuring 35.0 x 32.5 mm, while for RL12 the limit is a hexagonal shape with an edge length of 10 mm.

Book 9 LED modules can be mounted in a luminaire by means of screws. Zhaga defines the size and position of screw holes, because this is one of the essential features that ensure that different Book-9-compliant LED modules can be used interchangeably. 

However, many other features – such as the luminous flux or efficacy of the LED modules – are not restricted by the Zhaga specifications, allowing component suppliers to offer differentiated and value-added products.