Book 3 is now publicly available as free download from the Zhaga website www.zhagastandard.org. It defines the interface for a small, round, LED light engine suitable for spot lighting and other applications that need a point light source.
Zhaga specifications start their life as confidential documents, available only to the more than 270 members of the Zhaga consortium. Zhaga makes a specification publicly available when the first products that implement that specification have entered the market. As of today, 32 LED light engines and 2 luminaires have been certified to be compliant with Book 3. By publishing Book 3, Zhaga is enables everyone in the lighting industry to use these specifications. The right to display the Zhaga logo on products will remain available only to companies that are members of the consortium.
“LED innovation is swift,” points out Zhaga Secretary General Menno Treffers. “An LED state-of-the-art today will be outperformed by new LEDs within six months. As a result, luminaire manufacturers must continually upgrade the LEDs in their products. Until now, this has often required product modifications. By conforming to Zhaga interface specifications, manufacturers reduce the business risks of developing and selling LED lighting systems because the supply of components is more reliable, component stock levels can be lowered, and the risk of obsolescence and write-offs is reduced.”
The Zhaga consortium intends to foster the interchangeability of LED light engines by defining size, fixation method, thermal performance, light-emitting surface, photometric properties, and electrical characteristics, as well as the test procedures to certify compliance. Book 3 does this for the interface of an LED light engine consisting of a disk-shaped LED module designed to be screwed to the heat-sink base of a luminaire and controlled by a separately housed LED driver (an optional screwless, locking-ring mounting is also specified). The modules have a diameter of 50mm and a maximum height of 7.2mm, offering the optimum balance between compactness and thermal