Maxwell Multilight

"This drop-down controls whether Maxwell’s Multilight feature will be enabled during rendering. There are two Multilight modes available: Intensity and Color + Intensity. Note that the use of Multilight will greatly increase the memory required to render the scene, since separate output buffers must be maintained for each emitter contained in the scene. The Color + Intensity option multiplies this requirement even further."

This setting is super useful, turn it on by going to the Scene Manager > Output > Engine > Multilight > Color & Intensity