# mainLightIndex

> Configures what light should be used as main light.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.Rendering](/engine/6000.3/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public int mainLightIndex { get; set; }
```

### Remarks

If not set, main light will be the visible brighest directional light. This is used to perform per-object light culling for the main light.

Additional Resources: [ScriptableRenderContext.DrawRenderers](/engine/6000.3/script-reference/unityengine/rendering/scriptablerendercontext/drawrenderers.md).