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# intensity

The luminous flux, in lumens, or total brightness of the light. Animatable.

```
var intensity: CGFloat { get set }
```

## Discussion

When working with photometric lights (see the [`iesProfileURL`](/documentation/SceneKit/SCNLight/iesProfileURL) property) or physically-based rendering (see [`physicallyBased`](/documentation/SceneKit/SCNMaterial/LightingModel-swift.struct/physicallyBased)), you can leave the [`color`](/documentation/SceneKit/SCNLight/color) property at its default white color and use the [`intensity`](/documentation/SceneKit/SCNLight/intensity) and [`temperature`](/documentation/SceneKit/SCNLight/temperature) to control the light using realistic parameters. When working with physically-based materials, this value the luminous flux of the light source. The default value is `1000` lumens.

When not using physically-based rendering, this value (divided by 1000) serves as a multiplier for the the [`color`](/documentation/SceneKit/SCNLight/color) property. The default value of of `1000` leaves the light color unmodulated; you can use higher values, for example, to brighten a light whose color is already the maximum red value.

You can animate changes to this property’s value. See [Animating SceneKit Content](/documentation/SceneKit/animating-scenekit-content).

---

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