Been looking into dimmable LEDs, not cheap. My attic has knob and tube right now, wanting to update a separate committed line of 12/2, got to update breaker box and service line for 200 amps first…. lol got a list of to dos
Have a look at the relatively in expensive LED lighting I bought off of Amazon
https://modelrailroadforums.com/forum/index.php?threads/train-shed-layout-lighting.29921/
What do you need 200amp service up there for?? sounds like overkill