I’ve tried LPV not seeming to do much https://docs.unrealengine.com/en-US/…mes/index.html , but I’ll have another look. I have a semi large 2x2 world comp world,and lighting there is almost impossible atm, VERY inconsistent and I still can’'t get all areas right as some look decent and others completely washed out with light, fake looking- and very dim shadows to boot. Too complex atm, too many settings imho anyway,hard to know even how they all interact!
Physically based lighting HM but not great , and available as 4.22 but very basic stuff from what I’m seeing.
RTX would be nice, I assume you mean raytraced,and that’s fine, but I won’t be able to use it atm as yes I’m very near to being able to afford a gtx 1060 6gb which is now (with new drivers) a MINIMUM to do all of this, but even then you don’t get everything !! 
So no, that’s going to leave out a huge swath of artists and others, but then of course those are the breaks with lighting .
Cheapest I kind find and atm anyway outside my ability to pay for https://www.newegg.com/msi-geforce-g…-231-_-Product ,and THAT is refurbished o_0 . Yes what I’m doing is on the budget of someone who is disabled , but of course Seismic <grin> . My dev budget is first likely going to be for an AM4 system and max cores so lighting won’t be so grunt like.
This, ASUS ROG STRIX GeForce GTX 1060 Video Card ROG-STRIX-GTX1060-A6G-GAMING - Newegg.com-14-126-257--Product , seems to be a minimum for non refurbished , cheapest I can find but eventually here doable. LOL, the last card I paid almost that much was an awesome Gtx 8800 , & my current GTX 950 2gb cost me like $119.00, easy.