---
title: exposureOffset
framework: arkit
role: symbol
role_heading: Instance Property
path: arkit/arcamera/exposureoffset
---

# exposureOffset

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

## Declaration

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

## Discussion

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 is normally more performant than scaling each light source in your scene based on the value of the frame’s lightEstimate.