---
title: iesProfileURL
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnlight/iesprofileurl
---

# iesProfileURL

The URL for a file that contains photometry data describing the intended appearance of the light.

## Declaration

```swift
var iesProfileURL: URL? { get set }
```

## Discussion

Discussion A photometric light source is one whose shape, direction, and intensity of illumination is determined by a file in the IES format, containing physical measurements of a light source. Many manufacturers of real-world light fixtures publish such files describing the lighting characteristics of their products. This photometry data measures the light web surrounding a light source—measurements of the light’s intensity in all directions around the source. By default, this property’s value is nil. After setting this property to a URL that references a valid IES profile, you must set the light’s type property to IES to load that file and apply its effect.