> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/dragonfly-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/dragonfly-primer/components/6_alternativeweather/luminous_efficacy.md).

# Luminous Efficacy

![](/files/-MihrbSA5jmK1U3PakCm)

![](/files/-MihraPpz9i5W6J75jkl) - [\[source code\]](https://github.com/ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src//DF%20Luminous%20Efficacy.py)

Esimtate sky illuminance from the irradiance contained within a WEA object.

## Inputs

* **wea \[Required]**

  A Ladybug WEA object. 
* **dew\_point \[Required]**

  An annual data collection representing dew point temperature \[C]. 

## Outputs

* **dir\_ill**

  A data collection of direct normal illuminance values at each timestep of the WEA. 
* **diff\_ill**

  A list of diffuse sky solar illuminance values at each timestep of the WEA. 
* **glob\_ill**

  A list of global horizontal illuminance values at each timestep of the WEA.