What is the main source of light that is brighter but not brightest?

The key light serves as the primary source of illumination in a scene and is indeed typically the brightest light used in lighting setups for film and photography. However, it is designed to create depth and add dimension to the subject, while ensuring there are still other light sources in play, such as fill light, backlight, and accent light.

In cinematic lighting, the fill light is used to soften shadows created by the key light, and it is generally less intense, thereby supporting but not overshadowing the key light. Backlight provides separation between the subject and the background, adding depth, while accent light is used to highlight specific areas or details, often in a more subtle manner.

The key light’s role is crucial as it dictates the overall exposure and mood of the footage, making it the foundation of any lighting setup. Thus, it is accurate to say that it is the main source of light that is brighter compared to others, achieving a balanced yet dynamic look in visual storytelling.