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 # ExtendedSetSourceRatio 

 Last update: 17.07.2025 

## Description

Sets the value of one of the sources of an extended or a spectral map (0 if the map is not an extended or a spectral map).

**Note:**

The *User defined* mode must be active (*ExtendedSetActiveSource(-2)*) for the power ratio to be effective before using the *ExtendedSetSourceRatio* method. See the [ExtendedSetActiveSource](labvhv_extendedsetactivesource.md) chapter for more details.

## Syntax

*object*.ExtendedSetSourceRatio(int iSource, double dRatio) As Short

- *object*: Virtual Photometric Lab or Virtual Human Vision Lab object
- *iSource*: index of the source
- *dRatio*: value to set