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# PointLightComponent.SurroundingsLight

A component that specifies that the point light illuminates the physical and immersive environment.

```
struct SurroundingsLight
```

## Performance Considerations

Set [`attenuationRadius`](/documentation/RealityKit/PointLightComponent/attenuationRadius) deliberately on lights that use this component.
Its default is often larger than needed, and the resulting
on-screen footprint is the dominant driver of this effect’s cost.

The cost depends on how many pixels receive this effect, which is why attenuation radius is important.
There is also a cost for each light that is in each pixel.

Excessive use of this effect may contribute to user-noticeable frame drops
and can cause the device to heat up in graphically demanding situations.
Monitor the thermal state and  usage as a mitigation, if necessary.
Apps can monitor thermal state changes by subscribing
to the <doc://com.apple.documentation/documentation/Foundation/NotificationCenter/MessageIdentifier/thermalStateDidChange>
notification.

To stay responsive to the device’s available thermal headroom, read
<doc://com.apple.documentation/documentation/Foundation/ProcessInfo/thermalState-swift.property>
and observe <doc://com.apple.documentation/documentation/Foundation/NotificationCenter/MessageIdentifier/thermalStateDidChange>
to react when it changes. As the reported state moves from `.fair` toward `.serious` and `.critical`,
reduce the attenuation radius, or remove this component from lights where the effect
is not essential.

## Topics

### Initializers

[`init()`](/documentation/RealityKit/PointLightComponent/SurroundingsLight/init())

Creates a surroundings light component.

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`Component`](/documentation/RealityKit/Component)

---

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