![](https://www.trilux.com/en/lighting-practice/fileadmin/user_upload/Abb_Lichtlabor.pdf.png)
Photometric classification
![](https://www.trilux.com/en/lighting-practice/fileadmin/user_upload/Abb_Lichtlabor.pdf.png)
A very formal definition of the term luminaire is: Luminaires are devices used to distribute, filter and transform the light generated by light sources which are permanently installed in the luminaire or can be inserted into it.