Also, don't think that they were necessarily bought all at once. They might have bought a few to begin with and then when they went shopping again, they found something that fit their needs better, so they bought those then.
They could also be rented.
Not on a cruise ship... very rarely do installs rent lights.
Throw distance, speed, prisms effects, macro effects, physical size, cost... There are plenty of reasons to choose certain fixtures for certain areas/purposes. Sometimes you need something with a high output and a far throw that doesn't need to move fast, sometimes you need something small and compact that can throw light around fast but don't need a huge output. Other times you need a zoomable fixture with shutters and CMY. The list goes on... other times you have X to spend and need Y fixtures, so you divide and see what you end up with.
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