PS: If we're talking about the Enterprise in TOS, (NCC-1701, no bl**dy A,B,C or D), depending on the time period and what shots you look at in the show, she could have had illuminated Bussard collectors. Certainly they weren't there at the start, but the 11 foot model was retrofitted with lights in the nacelle caps which rotated by way of a motor and slip-ring system. This can be seen in some episodes. Other shots were done with a 3-foot model which had solid (unlit) nacelle caps, so either can apply.