I served in the U.S. Navy. There was no standard issue flashlight...you could use whatever brand of light you wanted, because you bought your own. The bridge crews used (and continue to use) red filters on their flashlights to preserve night vision, which is essential at sea. These bridge lights however are typically low powered, because they don't need to illuminate much of anything more than ten feet distant.
At night while at sea we rigorously enforced the "no lights on deck" rule, including prohibiting matches and lighters to fire up a smoke (on the antiquated theory that any flash of illumination, however dim, might give your position away to the enemy...or so the WWII era thinking went).
Inside the ship, there was no shortage of illumination, and nobody gave it much thought, unless they worked in one of the main engineering spaces. (Lots of good reasons to have a reliable flashlight down there.)