> For the complete documentation index, see [llms.txt](https://frinn.gitbook.io/custom-machinery-1.21/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://frinn.gitbook.io/custom-machinery-1.21/creating-custom-machines/machine-appearance/light.md).

# Light

Customize the light the machine emits.

Custom machines support light emission, to make your machine emit light you will need to define the `light` property inside the machine `appearance` property.

The `light` property define the light the machine will be emitting.

The light level must be an integer between 0 and 15 (defined by vanilla, a torch emit 14 and a redstone torch 7 for example).

Example :

```json5
"appearance": {
    "light": 15
}
```

{% hint style="info" %}
The default light is 0.
{% endhint %}