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D-Type signals are available in 1, 2 ,3 or 4 light heads and either with snow hoods (as shown) or with independent lens shades. Individual Green, Yellow, Red, and Lunar colors are available. Shown here with Lunar on the bottom, the Red and Lunar color positions on a 4 light head can be swapped based on the prototype you are modeling.
Searchlight signals produce 3 independent colors: Green, Yellow or Red from one LED. Searchlight heads can be placed either in direct alignment (zero offset) with the mast, or offset to the left or right of the masts.
G-Type signals like the D's feature individual single color LED's. Shown here with Yellow (left), Green (right) over Red. The Yellow and Green can be changed to Green and Yellow based on the prototype you are modeling. Lights & shades can also be deleted and covered to model 2 or even 1 light G-Type heads.