yea like, if you use a boolean, you make an object positive or negative, or intersect and it can be used for cutting objects. But a negative light in the way Dann-0 meant was probably a light emitting negative light. This is not as much a boolean operation as where the light is used to cut pieces out of objects, but it is a lighting operation, where instead of casting light the light "sucks the light away" A boolean is set to negative or positive or intersect in the objects attributes (when clicking on the small ") A lights brightness is set to negative or positive values in the light lab (when clicking on the small "e")

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