The  icon is used to position luminaires automatically and then start the calculation.

 In this mode, the program attempts to find ideal luminaire positions on the basis of the specified parameters and standards.

You first position the luminaires for the interior lighting. After clicking on the automatic placing icon, the Tunnel automatic Placement window will open.

Tunnel automatic placement window

You must place a tick in the box next to Interior lighting. In the last line entitled Position rounding you can also specify how accurately (in mm) the luminaires 

are to be positioned in respect of the x-coordinates. All the other input fields are only of relevance for optimising the entrance lighting.

Note: light distribution curves can be measured in different ways. This can lead to a different luminaire orientation in the program which, in turn, can lead to incorrect results. 

For this reason, it is important to always check for the correct luminaire orientation. In the 3D LDC view, you can check this with the  icon; 

in the 3D view, you can check it in the context menu by means of the Wire frame view option.

Luminaire orientation for interior lighting (left) and counter-beam lighting (right)

Once the interior lighting has been automatically positioned, further optimisation can be performed on this luminaire row, 

either in Tunnel automatic placement mode again or manually, until all the lighting engineering requirements are met.