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# exposureOffset

A value you supply to your custom renderer to light your scene.

```
var exposureOffset: Float { get }
```

## Discussion

If your app displays an AR experience using a custom Metal renderer, use this value to light your scene during its post-processed lighting stage.

Lighting a scene using [`exposureOffset`](/documentation/ARKit/ARCamera/exposureOffset) is normally more performant than scaling each light source in your scene based on the value of the frame’s [`lightEstimate`](/documentation/ARKit/ARFrame/lightEstimate).

---

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