.. _example2:

Example 2
---------

Example two aims to demonstrate how to perform a LEED option 2 daylight analysis.

\1. Start by opening the 3D modeller file containing the geometry to be analysed.

  .. image:: images/LeedModel1.png

Check that there are no errors by refreshing the analysis model, and ensure that the
surface reflectances and transmittances are setup appropraitely via the **Daylight**
menu and clicking on **Materials**.

\2. Launch the CBDM wizard by pressing **Analysis** and **Climate Based Daylight Modelling**.

Press **Next** to advance to the calculation settings page, and choose **LEED Option 2**
from the calculation type dropdown.

  .. image:: images/LeedOpt2.png

Name the run, so you can refer to it later. This is especially useful if you will
be performing multiple iterations.

The accuracy should be set to the **Reflection Convergence for Daylight Factors** option.

\3. Select weather data that represents where the building is situated.

  .. image:: images/LeedWeather.png

Tas can import a variety of weather formats including EPW weather files. To import EPW
weather files into tas, open the **Weather Database** application from the **Tas Manager**
and click **File**, then **Import Weather Data**.

If you create your own Tas weather files from EPW files, its always a good idea to verify
the quality of the data, in case the data is incomplete.


\4. Click **Next** and select which zone are to be included in the calculation.

Right click on them and click **Include**.

\5. Start the simulation by pressing **Next**.

  .. image:: images/LeedSimulate.png

\6. When the calculation is finished, press **Next** to view a report summarising the results.

If you selected an acceptable illuminance of 300 lux and an excessive illuminance of 3,000 lux,
the UDIa result would indicates the annual occurance of illuminances across the working plane
that fall into this range.