The various calculation parameters are set in the "Calculation objects" tool.

The arrows in the icons of the respective parameters point in the direction from which the light comes. The name of the parameter refers to the orientation of the calculation area.

**Horizontal illuminance:**

The light that hits a horizontal surface.

**Perpendicular ****illuminance:**

The vertical light hitting a horizontal surface.

**Perpendicular ****illuminance (Adaptive):**

The vertical light hitting a horizontal surface. The difference to the "Perpendicular illuminance" is that here the number of measuring points is automatically determined on the basis of the minimum and maximum values. This makes the calculation more accurate.

**Vertical illuminance:**

The light that hits a vertical surface.

**Unified Glare Rating (UGR):**

This parameter is used for calculating UGR values (see article: UGR method).

**Glare Rating (GR):**

The glare rating in the outdoor area is determined with the help of the GR Observer.

**Cylindrical illuminance:**

The cylindrical illuminance Ez is the mean value of the vertical illuminances formed over all directions around a point (on a vertical axis).

**Semi-cylindrical illuminance:**

The calculation of the semi-cylindrical illuminance is analogous to the cylindrical one (i.e. also cylinder axis with direction (0,0,1)). Here, the orientation of the semi-cylinder is additionally specified.

The average illuminance on the lateral surface of the semi-cylinder is the semi-cylindrical illuminance.

**Hemispherical illuminance:**

**Camera-orientated illuminance:**

**Daylight factor:**

** Custom calculation direction:**