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Mast Light Objects
An Mast Light object is an object element used to add some kind of standing laight source into your airport, and it can be selected from the Objects window:

Once you have chosen the mast light object, you can click the to add it to the scene then position it where required using the Gizmo.
Properties
The Properties window for a Light Mast object looks like this:

Display Name
This is the name of the element as defined from its type and the Name given to it.
Model GUID
This shows the unique GUID for the model being used as the mast light. If this is required for use in code or any other object, you can use the button to copy it to the clipboard.
Change Model
The button will open the model selector window, where you can see all the different models available for use in the simulation:

On the left of this window you can see the models that are available. These are displayed as thumbnails by default, but you can covert this into a list by unchecking the Thumbnails checkbox at the top. The thumbnails themselves can be made larger or smaller using the and buttons beside the checkbox. The list of models can be filtered using the input box at the top, along with the package list and tags to the right. Once you have selected a model, you can click the button at the bottom to assign it to the object.

