I don't think so. 30-310 gives the rules for row mounting. In general a light fixture not a jb. Flourescent lights may be used a raceways for connection to the next fixture when row mounted when marked for continuous row mounting but you could not use a fixture as a JB to say go to a switch and a receptacle. You could for example install a box and make your splices and cover the box with a fixture approved for such but you could not just use the KOs in the back of a flourescent fixture and drop in a feed in a feed out and a switch drop.
Part of these rules are also in part 2 of the code which we as installers don't refer to but the manufacturers do. Rarely, some fixtures have integral JBs.
