Once you have completed the interior lighting, you should generate a new row of luminaires for the entrance lighting. 

To do this, you can duplicate the existing luminaire group 1 by clicking on the right mouse button, opening the context menu and selecting the Duplicate option. 

You can also open the Tunnel structure context menu by means of a right mouse click and then select the New luminaire row option.

Once the new row of luminaires has been positioned, you must go to the Tunnel bar and the Illuminance type input field and allocate the luminaires to the Adaptation option. 

In this way, the only luminaire types used for the calculation will be those specified as adaptation luminaires in the Alternative equipment dialog.

Generating a new row of luminaires (left) and allocating these to the Adaptation luminaire type (right)

After clicking in the Tunnel bar on the automatic placement icon, the Tunnel automatic placement window will open. 

This must have a tick in the box next to adaptation lighting. 

The tick in the box next to Interior lighting is then removed.

Tunnel automatic placement window for entrance lighting

You can enter a large number of settings for the automatic positioning of the entrance lighting.In the Actualization [Update] input field, there are three options. 

With the Continued option, the luminaires are arranged in such a way that the CIE luminance curve is attained in an optimum manner as far as possible. 

This is the option that is normally used. The As stages option arranges the luminaires in such a way that the CIE luminance curve is replicated in stages. 

This requires a higher lamp power. This option should thus only be used for special cases. 

The Linear option allows the otherwise blocked input fields (grey) of Test luminance (linear) and Luminaire type to be selected. 

In this way, it is possible to establish the spacing between luminaires that is necessary to achieve a specific roadway luminance with the selected luminaire type.

The Linear option (left) and the calculated luminaire spacing - Delta (right)

The Step factor input field should only be used if the As stages option has been selected in the Actualization [Update] input field. 

With a step factor of 1, the luminance curve comes close to the CIE luminance curve. 

With a maximum admissible step factor of 3, the luminance curve is considerably higher than the CIE luminance curve, and the step shape of the luminance curve is clear to see. 

Luminance curve with the As stages option: step factor = 1 (left) and step factor = 2 (right)

The Maximum luminaire distance input field is used to specify the maximum possible distance between the luminaires of an individual control group that will ensure 

that sufficiently uniform lighting is still achieved. 

If this value is exceeded during automatic positioning, the program will automatically switch to the next smallest lamp power and shorten the distance between the luminaires again, 

in line with the luminous flux of the lamp.

Note: The maximum distance between luminaires has an influence on the uniformity of the lighting and the number of luminaires and must therefore be chosen very carefully. 

You can select the maximum distance between luminaires with the Linear option, for example.

The Min. luminaire dist. input field is used to specify the minimum distance that is possible between luminaires. 

This will depend on the size of the luminaire and any intermediate space that may be necessary between two luminaires.

The Hold the initial luminaire distance input field offers two options. First of all, you should perform a calculation with the No option, so as to achieve an optimum distance 

between luminaires for threshold zone 1 with a constant luminance level. 

If this has been calculated but the back section of the luminance curve (threshold zone 2 and transition zone) is not yet optimum, 

you can run through a calculation with the Yes option and hence fix the luminaire spacing in threshold zone 1 and only re-calculate the back section.

In the Luminaire dist. at the beginning input field, you can enter the luminaire spacing for threshold zone 1. 

This value will only be taken into account if the Yes option has been selected in the Hold the initial luminaire distance input field. It must be re-entered prior to each new calculation.

In the Factor length input field, the luminance curve can be moved to the right so as to ensure that the target curve is attained. 

If you only wish to correct the back section of the luminance curve (threshold zone 2 and transition zone), 

you must select the Yes option in the Hold the initial luminaire distance input field and enter a previously determined value in the Luminaire dist. at the beginning input field.

Luminance curve with a length adaptation factor = 1 (left) and a length adaptation factor = 1 .15 (right)

In the Factor luminance input field, you can shift the luminance curve upwards so as to ensure that the target curve is attained. 

If you only wish to correct the back section of the luminance curve (threshold zone 2 and transition zone) 

you must select the Yes option in the Hold the initial luminaire distance input field and enter a previously determined value in the Luminaire dist. at the beginning input field.

Luminance curve with a luminance adaptation factor = 1 (left) and a luminance adaptation factor = 1 .1 (right)

In the Position rounding input field, you can specify how accurately (in mm) the luminaires are to be positioned in respect of the x-coordinates.

Once all the input fields in the Tunnel automatic placement input field have been selected, you can start the calculation with the Place button. 

The program places the luminaires with the highest light flux at the start of the tunnel for threshold zone 1, with a constant spacing between luminaires. 

In threshold zone 2 and the transition zone, the luminance level is reduced by increasing the distance between the luminaires. 

If the maximum possible distance between luminaires is exceeded, the program will switch to the luminaire with the lower luminous flux, etc.

Note: With a low luminance level, it can happen that the highest lamp power (e.g. 400 W) cannot be used, since this would mean that the maximum possible distance between luminaires was exceeded.

After the calculation, you can look at the luminaire list in the Tunnel bar. The luminaires are allocated to the corresponding control groups as a function of the number of regulating steps and groups. 

With 3 control groups in the adaptation zone this can be as follows, for example:

3 2 1 3 2 1 3 2 1 3 2 1…….2 1 2 1 1 1 1

Luminaire list for 3 control groups (left) and 4 control groups (right)

Depending on the lighting engineering results obtained, further corrections can be made after the automatic positioning and calculation has been performed, 

either using the Tunnel automatic placement mode again, or by making manual corrections to the luminaire arrangement.

Note: With luminaire arrangements where interior and adaptation luminaires are positioned on the same axes (y-coordinate), it is necessary to make sure, 

once all the luminaires have been placed, that the luminaires do not collide with each other. In the event of a collision, these luminaires must be moved in the x-direction.