Seems that the courts from 2k18 work exactly the same for 2k19 no need for a conversion.
NBA2K19 2018-09-08 02-31-38-56 by ebook22, on Flickr
NBA2K19 2018-09-08 02-33-04-45 by ebook22, on Flickr
NBA2K19 2018-09-08 02-33-11-34 by ebook22, on Flickr
I will work on arena lighting tomorrow.