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This blend mode simply adds the pixel values of the light over underlying lights (composited on the canvas).

See how the 3 colors mix to create white as the lights are added together.
blend_modes_add

 
See how 3 soft round lights are added to this HDRI map using add blend mode.
Add blend mode is ideal for adding lights and is the default blend mode for Round, Rect, Hex, Gradient Lights, Gradient Background and Picture Background.
Dark light has blend mode add with invert.
 
blend_modes_add_2

Use Add with the Invert option on to Subtract. This blend modes simply subtracts the pixel values of the light over underlying lights (composited on the canvas).
blend_modes_add_invert

See how 3 soft round lights are subtracted to this HDRI map using add blend mode with invert option on. They darken the image.
blend_modes_add_invert 2

 

Lighting addon for your 3D software

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