Insert symbols an equal distance apart from each other

We will now insert light fixtures to a room with a specific distance.

Tip: To make indicating corners easier, activate the End snap during this function: press Shift down, right-click and select End.

Do the following:

In the symbol selection window, select Electric > Light fixtures > Common and then the Light fixture, flush (scalable) symbol:
From the top part of the symbol selection window, click the Insert symbols in area button:

The Areal insertion dialog opens.
For Symbol angle, select 0.
For Insertion method, select With spacing.
For spacing, enter 1800 in both fields.
Click OK.
As the X size, enter 600 and click OK.
As the Y size, enter 600 and click OK.
Indicate the first corner of the area.
Indicate the second corner of the area.