New in Carbon (Drop 2)
Please note in Carbon (Drop 4) the Value Blend settings are now found within a tab in the Content section, reducing the need to scroll the light properties panel which was getting quite tall.
Value Blend is a new section added to the Light Properties panel. It allows blending of the luminosity values from a secondary piece of content with the primary light content. It provides a way to tweak the character of the light source. For example adding a hot spot into an existing soft box, or graduating the light brightness across your light.
...