> 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/3_recipes/radiance_parameter.md).

# Radiance Parameter

![](/files/-MihqeXhFR8Gu9hmX5ae)

![](/files/-MihqeXiTUzOhGpwsbPj) - [\[source code\]](https://github.com/ladybug-tools/honeybee-grasshopper-radiance/blob/master/honeybee_grasshopper_radiance/src//HB%20Radiance%20Parameter.py)

Get recommended Radiance parameters given a recipe type and a level of detail.

The original recommendation for the various Radiance paramters comes from this document. <http://radsite.lbl.gov/radiance/refer/Notes/rpict\\_options.html>

This presentation by John Mardaljevic gives a good overview of the meaning of each radiance paramter. <http://radiance-online.org/community/workshops/2011-berkeley-ca/presentations/day1/JM\\_AmbientCalculation.pdf>

### Inputs

* #### recipe\_type \[Required]

An integer or text for the type of recipe. Acceptable text inputs are either the full text of the recipe type (eg. point-in-time-grid) or the name of the Radiance command for which the parameters are being used (eg. rtrace). Choose from the following options.

```
* 0 | rtrace     | point-in-time-grid | daylight-factor

* 1 | rpict      | point-in-time-view

* 2 | rfluxmtx   | annual
```

* #### detail\_level

An integer or text for the level of detail/quality for which radiance parameters will be output. (Default: 0 for low). Choose from the following options.

```
* 0 | low

* 1 | medium

* 2 | high
```

* #### additional\_par

Text to override the Radiance parameters as needed. Radiance's standard syntax must be followed (e.g. -ps 1 -lw 0.01).

### Outputs

* #### rad\_par

Radiance parameters as a text string. These can be plugged into the radiance\_par\_ input of the various recipes.