The background light is used to illuminate the background area of a set.

The background light will also provide separation between the subject and the background.

By adding a background light to a set, filmmakers can add a sense of depth to shots.

In film, the background light is usually of lower intensity.

The background light also generates electrons, which have to be stored.

The background light is placed behind the subject(s), on a high grid, or low to the ground.

However, the background light is affected to a much greater extent, which creates the phase contrast effect.

In its positive form, the background light is instead phase shifted by +90 .

The video shifts between this and the band performing in a black environment with a small bit of background light.

Indeed, the amount of background light is irrelevant, since the device "sees" only heat.