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 # ExtendedSetActiveSource 

 Last update: 17.07.2025 

## Description

Sets the active source of an extended or a spectral map (0 if the map is not an extended or a spectral map).

## Syntax

*object*.ExtendedSetActiveSource(int iSource) As Short

- *object*: Virtual Photometric Lab or Virtual Human Vision Lab object
- *iSource*: index of the source to activate
    
    You can set the *iSource*behavior as follows: - **-1** to set all sources activated at 100% power ratio (equivalent to the *All layers*mode in Virtual Photometric Lab). - **-2** to activate all sources depending on their current power ratio (equivalent to the *User defined* mode in Virtual Photometric Lab).