Just a point but while deck floodlights on (say) an offshore support craft may be very bright, navlight bulbs on real ships are usually only about 40 - 60 watt, Some models I've seen appear to have 1000 watt nav lights.
For those into offshore transport barges, many of these use gas-powered navlights with mantles such as any caravaner in the past would have been familiar with. In a previous life I was responsible for a fleet of offshore barges and, as there was no uniformity of gas mantle type fitted, I accumulated a variety of British and Continental mantles and an encyclopedic knowledge of their origin and availability that would have qualified as a specialist subject on Mastermind.