Light is what the camera actually records. Direction, hardness, colour and the ratio of light to shadow set the mood of a shot more than any adjustment in post-production.
Reading
Articles in preparation; the tables and terms are already in the department.
Viewers will forgive a weaker picture sooner than bad sound. Intelligible dialogue, clean ambience and loudness that suits the target platform are the minimum that decides whether anyone watches the video to the end.