But these bright lights turned me to a monster

from Drake (Ft. Jay Z) – Light Up Lyrics on Rap Genius

Meaning

Being in the spotlight and the money he gets from it changed him in a bad way because he’s addicted to the lifestyle.

Also, Jay’s showing the downside of the big city life that he celebrated in “Empire State of Mind” with the hook

Big Lights will inspire you
Let’s hear it for New York, New York, New York

Worth noting that mentioning lights (especially in a fame context) is usually a hallmark of Jay’s protege Kanye West (see Flashing Lights, Big Screen, Street Lights etc). Given the timing of the release, this could be a reference/foreshadowing to Kanye’s All of the Lights and Monster from My Beautiful Dark Twisted Fantasy. Jay featured on the latter, as did Drake’s YMCMB cohort Nicki Minaj.

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