one thing to keep in mind is that rect area lights are super expensive, i think the most expensive light of them all. did you know that you can get the same effect for free by using environments. Live envmaps and getting realistic studio lighting almost for free
some demos:
in vanilla it’s something like this:
const g = new PMREMGenerator()
g.fromScene(...)
the scene now just has simple planes in them, if you increase colors so that they fall out of 0-1 range they start to act as lights. for instance a color.setRGB(100, 0, 0) would be an intense red.