The lighthing is also super simple (but there's some tricks)

So first of all there's a sphere around the scene that's 20% white (that mean no reflections are pure black)
Then I added four point lights, they only affect the specularity of the material !
There's a also two discs (show here as white squares) that are 100% white and emit light.

There's some depth of field, subtle ambient occlusion and blurred reflections (around 30% blurry).