Remember the cinematographers job is to mostly bring what the storyboard artist and director created on paper to life.
So the draining of the light is ultimately the choice of whoever directed that episode and the storyboard artist they worked with (some get more free reign than others). It's the job of Michael Slovis to make it a reality.
Keep in mind Slovis is also a director on the show. The writers also direct, etc.
The idea to turn Walt into a villain was Vince Gilligan's idea, but the idea to use light to symbolize it was all Slovis, from the second season he was on the show. Sony/AMC was like "why is everything suddenly darker?" and he explained it to Vince Gilligan, who was at the idea.
Fred.