No not making your own, much better than that, using someone elses!
Jobo has created a super cool open source, free to use lighting system for GMS2 that I wish had existed in this kind of form when I was making Another Perspective.
He asked me if I could do a quick tutorial on how to set up and use it and I was happy to oblige. I'm finishing this off hopefully today w/ Patron release, before diving fully into RPG land and then doing a public release of the video on Friday.