At night, perhaps, there could be different shades of light for the searchlights.
Where they had smaller incandescent lights, the light would be more amber.
Where they had carbon arc search lights, such as on the destroyers, the light would be blueish, such as this one:
https://unitedstatesarmynavy.com/202...-signal-light/
Also:
https://en.wikipedia.org/wiki/Search...cond_World_War
BTW, the searchlight in Wolfpack look cool!