Combined dimming characteristic curve

This setting corresponds to a combination of linear and logarithmic dimming characteristic curve. The gateway converts KNX brightness values into suitable DALI dimming values, but not as intensively as with linearisation of the characteristic curve. The combination of a less severe value adjustment and the logarithmic dimming characteristic curve of the DALI operating devices results in a curved characteristic curve of the relative luminous flux at the physical output of an operating device with a less severe gradient especially in the upper dimming range. KNX status telegrams of the effective DALI brightness value are possible in this case too.

Example of brightness change:
KNX brightness: 50% -> DALI data value (APL): 147 -> Luminous flux: approx. 5.4% -> The human eye subjectively perceives about slightly more than half of the lamp brightness.
KNX brightness: 75% -> DALI data value (APL): 224 -> Luminous flux: approx. 44% -> The human eye clearly perceives a brightness difference to the previous dimming setting, however it is not very intensive. However, the dimming process may still be continuous, depending on the lamp.

The combined dimming characteristic curve is a compromise between linearisation and adjustment to the subjective brightness perception of the human eye. It can be used as an alternative to the linear or logarithmic characteristic curve if the dimming behaviour of a lamp does not meet the user's requirements when using the other two dimming characteristic curves.