I fell into that rabbit hole a while back…heres a link i found useful.
California Lightworks Far Red
and then I opted for this guy, cuz I didn’t want to deal with the par floor light mounting.
https://www.amazon.com/gp/product/B08GGP7H1Y/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1?tag=greenrel-20
after lots of reading, I only use at lights out, 5 mins before Off to 10mins after Off. Supposed to allow 13on/11off light cycle in flower, due to phytochrome transition.