whats the go with installing downlights in a unit top floor fire rated ceiling?

[wozzzzza]

have a unit complex 3 stories, someone wants to install downlights in the ceiling up there on the top floor, its double sheeted Frye check and obviously fire rated.
whats the deal with installing downlights properly here? whats required to keep fire rating??

[rambunctious]

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[droog]

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[wozzzzza]

hearing and seeing conflicting information so far where i have been looking, some say fire rated light only some say you need the fire proof cone over the top and needs to be certified by as well afterwards etc.. dont know know what to believe, still researching it all.