# Debug Lights<no value>
The User Lights window is used to show information and debug the different lights on an aircraft. It can be opened from the [Tools](../../menus/tools/) menu and will look something like this by default:

{{< image-center
    src="images/2_DevMode/simobject_editor/debug/user_lights/windows_10.png"
    alt="The User Lights Window" >}}

 

This window is split into two main section. At the top you have the tools for in-sim visualisation, and below that you have the information about each individual light.

 

For in-sim visualisation, if you click the **Show Effects Position** box, it will enable debug information to be drawn directly over the simulation, something like this:

{{< image-center
    src="images/2_DevMode/simobject_editor/debug/user_lights/windows_11.png"
    alt="Light Information Shown As An Overlay Within The Simulation" >}}

The actual information shown will depend on which of the other checkboxes you have ticked:

-   Click the **Show Flashlight** option to toggle on/off the display of the pilot flashlight.
-   Click the **Show Name** option to toggle on/off the name text in the overlay.
-   Click the **Show Direction And Cone** option to toggle on/off the direction and cone information in the overlay.
-   Add text to the **Filter** input box to filter the lights shown in the overlay.

 

The section beneath the visualisation options lists each individual light and also gives a couple of global options:

-   **Override Light System**: Checking this actiavte the light system override, disabling all lights by default, and enabling the two buttons listed below.
-   `Active All Lights`: Clicking this will enable all the defined lights at once.
-   `Deactivate All Lights`: Clicking this will disable all the defined lights at once.

 

Below the global options you have the list of individual lights, split into the following sections:

-   **Denominator**: The light denominator, as defined by the `[LIGHTS]` section of the `system.cfg` file for the aircraft.
-   **Effect**: The name of the effect file that the light is using.
-   **Node**: The name of the node where the light should be spawned.
-   **Mesh Name**: The name of the mesh used by the light for close inspection.
-   **Mesh Mat. Name**: The name of the material that has been assigned to the mesh.
-   **Position**: The X/Y/Z position of the light, relative to the [Datum Reference Point](../../../content-configuration/modular-simobjects/aircraft/aircraft/#datum-reference-point).
-   **Rotation**: The rotation of the light around the X/Y/Z axis.
-   **Active Parameters**: Show or hide the active emitter parameters for the light.

 

All of the fields mentioned above are **editable** and so you can use them to change any of the available parameters for the light, and these changes will also be reflected in the in-sim visualisation. However, **these changes will not be saved** with the aircraft, and are designed so you can tweak values and see what the outcome is before doing any edition of the `system.cfg` file.

 

Note that the **Active Parameters** section has two buttons: `Not Selected` and `EmitterN`. Clicking on the emitter button will expand the light list of the current light and show the emitter information:

{{< image-center
    src="images/2_DevMode/simobject_editor/debug/user_lights/windows_13.png"
    alt="The Emitter Section For A Light" >}}

As with the general light data, all these fields are editable, although they won't be saved. Each field represents the following information about the light emitter:

-   **minProjSize**: The minimum projection size on-screen. Use {{< input "Ctrl" />}} + left click to edit, or click and drag the slider.
-   **Start**: The starting color RGBA components.
-   **End**: The ending color RGBA components.
-   **Type**: The type of light being emitted (*None*, *Spot* or *Omni*).
-   **Size**: The size of the light emitter.
-   **Range**: The range of the light emitter.
-   **Intensity**: The intensity of the light, between 0 and the Maximum Intensity (set below). Use {{< input "Ctrl" />}} + left click to edit, or click and drag the slider.
-   **Maximum Intensity**: The maximum possible intensity for the light.
-   **Softness**: The softness of the light.
-   **Volumetric**: Whether the light is volumetric (1.0) or not (0.0).
-   **Scattering Direction**: The scattering direction for the light.
-   **Inner Angle**: The inner angle of the emitter.
-   **Outer Angle**: The outer angle of the emitter.

 

Once you are finished reviewing and/or editing the details listed here, you can then click the `Not Selected` button to close the emitter information.