Which type of light is generally less intense than the key light?

Fill light is generally less intense than the key light because its primary purpose is to soften shadows created by the key light and to provide additional illumination in the scene without overpowering the main light source. The key light is the strongest and most dominant source of light, typically positioned to produce the desired lighting effect and create the main highlights on the subject.

Fill light helps to balance the overall lighting by filling in darker areas, thus ensuring that details in those shadowed regions are visible while still maintaining the depth and dimension that the key light provides. This balancing act allows for a more natural and visually appealing look.

The other types of lights mentioned serve different purposes. Back light is used to create separation between the subject and the background, often resulting in a more dramatic effect, and it can sometimes be equal to or more intense than the key light. Spotlight technology focuses light to illuminate specific areas or subjects with intensity, which often exceeds that of the fill light. Dimmer light refers to the use of a dimmer switch for adjusting light intensity but does not represent a specific kind of light in the context of lighting setups.