This began as the excellent Persona5 Royal restaurant freebie neatly ported to MMD/PMX by ominous-words...
https://www.deviantart.com/ominous-words/art/MMD-DL-Persona5-Royal-Restaurant-Stage-v1-01-881644013
After exporting from PMX Editor as OBJ+MTL, I tackled the luminaires. Examining the ~77 ''materials'' listed in PMX Editor found a dozen lights or lanterns. Took me a while to realise that the three ''pendant'' lamps had separate materials for ''lit''. I liked that !! The five booths'' boxy lanterns and their down-leads each had their own materials, although two shared. I could not find any lamp for them. Examining the model mesh showed each down-lead had an empty holder.
Upside, I did not have to UV-map the lamp-holders, mask out bulb from fitting...
After several tries, I imported the OBJ at ~3.5% of original scale, so seat-height came just below figure''s knees. I found model needed yTran: -222. YMMV. MTL auto-loaded the 77 texture calls. The PMX version had a sorta-boardwalk at seat level, perhaps to give a more traditional feel to ''chair'' seating. It was unsupported, looked odd, so I hid it using 100% transparency.
For the missing bulbs, I began by making an end booth''s boxy lantern 100% transparent. Loading a Poser primitive ball then using wire-frame mode and checking from different angles, I maneuvered the ball up to the bulb-holder. I found ~35% of default scale looked right, such the ball nestled in the holder. I used ''duplicate'' tool to clone ''ball_1'' as ''ball_2''. This was easily slid along ''into'' next booth''s lantern. Like-wise clones _3, _4 and _5 into theirs. Making the lanterns transparent by turn, I fitted their ''bulbs'', too. When I dialled back the lanterns'' transparency, I realised I could have done the fitting using 50%...
Rather than faff around with nodes and cycles, I just dialled the three pendants'' light material and the five balls to ''super-ambient''. As I final step, I ''parented'' each ball to the restaurant so they''d follow any offset.
A trial render showed the scene was too dim as-is, so I adjusted Poser''s spotlights, arranged an IBL light just below the ceiling. Now it was ''fashionably'' dim.
Thankfully, it was still brighter than a glowingly-reviewed ''nouvelle cuisine'' diner my fiancée chose, but I still remember with a shudder. Yes, I had to steal tea-candles off adjacent tables for us to find the cutlery, then deploy my pencil torch for us to read the menus. Worse, when a plate was belatedly set before me, I politely reminded the waiter that I''d not ordered a starter. Oops. That was the ''Main''. I''d put more in a split-roll for a light snack...
Back to this restaurant: After another trial render showed bright enough, I sent the job to my networked ''Box'' as Superfly, 96 pixel-samples, progressive, 64 vol-bounces & buckets. It ran 1½ hours...
A main course that looks like a starter ! Yep, too many of that around! A friend once ordered an 'espresso'; it was such a tiny coffee that she had to order another!