> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/hb-radiance-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/hb-radiance-primer/components/2_lightsources/certain_illuminance.md).

# Certain Illuminance

![](https://2572426507-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Ma9X8PomX22wWVDNCoj%2Fuploads%2Fgit-blob-68b34397203d4457606191f4f133c93d0856f47f%2FCertain_Illuminance.png?alt=media)

![](https://2572426507-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Ma9X8PomX22wWVDNCoj%2Fuploads%2Fgit-blob-48687391e137ac0fd4ac8a62a3c12b4414115902%2FCertain_Illuminance.png?alt=media) - [\[source code\]](https://github.com/ladybug-tools/honeybee-grasshopper-radiance/blob/master/honeybee_grasshopper_radiance/src//HB%20Certain%20Illuminance.py)

Create a uniform sky that yields a certain illuminance.

### Inputs

* #### value

Desired value for sky horizontal illuminance in lux. (Default: 10000).

### Outputs

* #### sky

A honeybee sky that can be used to create a point-in-time recipe.