To set the maintenance method and maintenance factors for the lighting installation, four steps are necessary.

  1. Selection of the maintenance method of a fixed or detailed maintenance factor according to CIE 97:2005 for indoor or outdoor spaces, embedded spaces and open terrain.
  2. Positioning of the lighting in the selected spaces
  3. Adjustment of the maintenance factors for the luminaires fixed or detailed in according to CIE 97:2005
  4. Documentation of maintenance factors

Step 1
Selection of the maintenance method for the different space types:

Indoor spaces

Evo automatically creates a space for all constructed rooms within a storey.  

To select the maintenance method, switch to the "Spaces" tool. The tool is once in Construction mode and once in Light mode.

With the spaces tool selected, you can now click on the desired space in the CAD on the right. This is then highlighted in blue. On the left, in the Maintenance section, you can choose between a fixed maintenance factor method or the detailed method.

If you decide to use the fixed maintenance method, the fixed maintenance factor will be taken into account in the calculation for all luminaires that are in this space.

If you decide to use the detailed method, you can still specify the inspection interval and the ambient conditions. For more details, see the publication CIE 97:2005 2nd.

The maintenance method for an indoor space is now set. If you now place luminaires in this space, they will use the maintenance factors according to the maintenance method in the calculation.

Outdoor spaces

The same applies to outdoor spaces as to indoor spaces. The difference between the two is that outdoor spaces are created with the spaces tool outside buildings on the site.

The sapces tool also allows you to choose between a fixed or detailed maintenance method here.

Embedded spaces

Evo allows you to embed or overlap spaces both indoors and outdoors. The maintenance method can then be selected separately for each space. Later, you can select at the luminaires to which space they belong, if the luminaires are in more than one space.

Site space

The site space is the space that is outside of buildings and on which no outdoor areas are constructed. The site space is the area that remains when all buildings and outdoor areas are punched out of it.

For this space there is also the possibility to select the maintenance method. To do this, you must switch to the site tool under Construction and select between the fixed or detailed method there. All luminaires located in this space will then use the maintenance method of the site space.

Step 2
Positioning of lighting in the spaces

Basically, Evo uses the maintenance method of the selected room/ space as a standard for all the luminaires within the room/ space. If you place new luminaires within a room, they automatically inherit the selected maintenance method of the room.

If you work with embedded or overlapping spaces as well as outdoor areas, please note the following:

Evo uses the coordinate system of luminaires for the assignment between luminaires and spaces.

If the coordinate system of a luminaire in the plan view is not within the desired space, this luminaire is not assigned to it.

When placing a luminaire in a space, the maintenance method for this luminaire is updated. Of course, this also works with a multiple selection of luminaires.

If, in a luminaire arrangement, part of the luminaires are in one space and another part of luminaires are in another space, Evo will take this into account for the luminaires in each case.

Step 3

Adjustment of the maintenance factors for the luminaires

If you have now constructed the spaces, selected the maintenance methods and placed luminaires, you can now change the maintenance factors for luminaires in more detail. For this purpose, Evo provides you with another tool, "Maintenance factors", which belongs to the Light mode.

The tool basically works with a selection of luminaires. When this tool is active, you can process individual luminaires, luminaire arrangements or any selection of luminaires by selection frame. When you select the luminaires of a space, there are two different setting options on the left side.

Fixed maintenance method

In case the selected luminaires are in a space with a fixed maintenance method, you can select a fixed maintenance factor between 0.0 and 1.0.

Enter this under fixed maintenance factor. Evo will then apply the fixed maintenance factor for the selected luminaires.

When you confirm the fixed maintenance factor, a small lock symbol appears to the right of it. This symbol is to show you that you have deviated from the original default value and overwritten it. If you want to retrieve the default value, simply click on the lock symbol. It then disappears and the default value is set again.

The selection box above the fixed maintenance factor can be used to change the assignment of the luminaires to your space. If the luminaire is in more than one space, you can assign the luminaire to these. In Evo, a luminaire can only be assigned to one space and thus to one maintenance method.

After installing Evo, the fixed maintenance method for spaces is always used as the default.

However, you have the option of adjusting the default behaviour in the settings dialogue for the standards. You can choose between the fixed method with a fixed maintenance factor or the detailed method. After you have changed this, it is used as the default for the maintenance method when constructing spaces.

It is important to know that you only change the luminaires that are currently selected. Other luminaires are not adjusted.

This also applies in case there are luminaires in an arrangement. Evo offers you the possibility to adjust each individual luminaire.

The calculation queries the maintenance factor at each luminaire separately. If you select the luminaires of an arrangement and have previously changed the maintenance factors for some of the luminaires, then luminaires with different maintenance factors are present in the arrangement.

Evo indicates this by crossed-out input boxes.

If you then enter a new value in the crossed-out box, this entry will again be applied to all selected luminaires.

Detailed maintenance method

In the case that the selected luminaires are in a detailed maintenance method space, you can make more settings.

The resulting maintenance factor of a light emitting surface is the product of the room maintenance factor with the luminaire maintenance factor, the lamp lumen maintenance factor and a lamp survival factor. (MF = RMF * LMF * LLMF * LSF). The tool gives you the possibility to make settings for the room, the luminaire and the lamps. These settings are applied to all luminaires that are currently selected in the CAD.

The following settings for the mentioned factors are always adjusted per light emitting surface of the luminaires. You therefore have the option of adjusting each light emitting surface individually.


Evo shows you the calculated room maintenance factor here. For indoor rooms, you can see here which ambient conditions and which inspection interval are set for the space.

For an outdoor space, you will find the pollution category here. At the bottom of the settings you will again find a selection box with which you can change the assignment to another space. This only applies to luminaires that are located with their coordinate system in more than one space.


Evo shows you the calculated luminaire maintenance factor here. Here you can see which luminaire type and which cleaning interval are set for the luminaires. If you change these settings, Evo recalculates the luminaire maintenance factor.


Evo shows you the calculated lamp lumen maintenance factor and the lamp survival factor here. Here you can change information about the lamp. When you change this data, the factors are recalculated directly.


Under Result you will find the maintenance factor that is transferred to the calculation for this light output. Under Note you can enter a note that is part of the documentation.

If you cannot find a luminaire or lamp type in the selection lists, you can also overwrite the factors with fixed values. In the following image you can see which of the factors can be overwritten with fixed values. If you overwrite one of the factors, a small lock symbol appears on the right. This symbol shows you that the standard calculation has been exchanged for a fixed value. If you click on the lock symbol, the fixed value is discarded and Evo uses the standard calculation.

If you overwrite the luminaire maintenance factor, Evo displays a text input field instead of the selection box. Here you can enter the luminaire type as text. This information can then be found in the maintenance data documentation. If you overwrite the lamp lumen maintenance factor or the lamp survival factor with a fixed value, you also have the option of entering a text for the lamp type. This is also part of the documentation.

Step 4
Requesting the documentation

The documentation of the maintenance factors for luminaires is carried out at space level. For each space, a summary is created as an overview. If the fixed maintenance method is used for this space, the fixed maintenance factor is documented on the summary.

If the detailed maintenance method applies to a space, a separate output with the name "Maintenance factors" appears in the output tree on the left. For indoor spaces, these are subordinate to the room. Outdoor spaces are below the site node. The documented maintenance factors are only created for luminaires that are also assigned to the space. As already mentioned, you can adjust this via the selection boxes in the "Maintenance factors" tool.