The Insert Photometric Solid: Line command is used to insert light-obstructing objects that are shaped like a line. These objects are not closed.
To define a photometric solid line, go to
Ribbon: DM Electrical->Point-by-Point Photometrics-> 
Insert Photometric Solid: Line
Pulldown Menu: DM Electrical->Point-by-Point Photometrics->Insert Photometric Solid: Line
Insert Photometric Solid: Line Dialog Box
See the Common Photometric Solid Information section for more information about the values in this dialog box.
Enter the relevant information into the dialog box and press the OK button. You will be prompted to specify the starting point of the solid line.
Specify first point of line:
You will then be prompted to specify the ending point of the solid line.
Specify next point:
You can specify additional line points or press ENTER to end the line. The solid line will be displayed on the drawing and included in the photometric calculations.