Not all light properties are visible in Phototuning. In the image below, the properties that are visible when making a render, are marked with orange. All properties are visible in 3D-view.

Recessed light source and visible in Phototuning

When the setting Use as recessed light source is enabled under special settings in the light properties, the light will be shown as a disc. If Use as recessed light source is off, a bright sphere is visible. In the table below you can see the effects in a comparison of the settings.

Use as recessed light off: point light is placed close to ceiling hence brightness is high right below the ceiling. It creates a bright spot visible on the picture. Visible in Phototuning off: point light itself is not visible.

Use as recessed light on: spot on the ceiling is not visible. Visible in Phototuning off: point light itself is not visible.

Use as recessed light on: spot on the ceiling is not visible Visible in Phototuning on: point light is visible in form of a disk.

Use as recessed light off: piont light is placed close to ceiling hence brightness is high right below the ceiling. It creates a bright spot visible on the picture. Visible in Phototuning on: point light is visible in form of a sphere.