Hmmm, curious. The type 075 has two sets of port and starboard navigation lights. One Set below flight deck On the forward corner of the first sponson from the bow, the second set on the superstructure just forward of the close-in defence missile launcher.
I’ve never seen any other ship that carry two set of port and starboard lights. it would be quite against normal navigation practice to use both sets at once. I wonder when each set would be used.
perhaps the set above deck is for normal navigation use, the set below deck is for use when Conducting nighttime flight operations so as to not destroy the night vision, or saturate the low light goggles and cameras of the crew and pilots on deck