Inside this dialog the luminaire type can be activated for emergency lighting only or
for artificial lighting as well. One of the two options has to be chosen.

Activate emergency lighting for a placed luminaire of this type

After a luminaire of this type has been placed into a scene, emergency lighting has to

 be activated in the properties tab for this luminaire. For this purpose the checkbox

Emergency lighting on has to be ticked.

Insert an emergency area into the scene

Finally an emergency area has to be placed into the scene by going to the ribbon 

menu  „Insert“  and pressing the subsequent button  „Measuring object“.