The Flash effect from this attachment is treated as the same effect as the white magic spell, thus if it is used while the enemy already has a flash effect on it, it will have "no effect", and vice-versa.
Unlike the magic spell, the Flashbulb's version is treated as a job ability instead of a spell. It does not require MP, and can be used even if the automaton is inflicted with silence.
This also does not generate the level of enmity that the spell does.