> 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

![](/files/-MihqYhiiPEoGFNYBexH)

![](/files/-Ma9XLn-FW5hkCQzqNjl) - [\[source code\]](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.