Full tutorial - https://gumroad.com/l/WSSsE
Achieving believable cinematic lighting can be challenging.
Especially, when it involves tons of light sources your render time goes up and it becomes very difficult to make any big changes and experiment with your lighting.
Having the same frustration in past, I developed this technique that allows you to be less technical with your lighting and as a result, be more creative.
Octane renderer is used for these examples, but this technique can be applied in any other 3D renderers.