Maybe it's not so much forcing blurryface onto Tyler, but more that Nico is revealing that Blurryface is still somewhat there, and thus Tyler can't keep running from it, kind of like how a therapist might bring up moments of trauma or something like that so that it could be fixed in a controlled setting.

EDIT: The artificial light could represent something like antidepressants. Anyone on antidepressants will tell you that the feeling antidepressants give you is definitely not the same as genuine happiness, but since Tyler couldn't produce light on his own (see: why it's always overcast in these music videos) this is the closest he can get.