Instance.new("SubtractPointLight")

[VonStalhein]

So, as seen from this thread there seems to be support for a new type of PointLight.

It would work much the same way as the current PointLight, except that it subtracts the light in its affected area.

Alternately:

On another topic

An even better idea is to add a modifier to existing light objects (or allow negative values for Brightness) to make the contribution to light intensity negative instead.

Either way, this would open up a huge range of possiblities for more dynamically-lit games and effects.

[1waffle1 (Waffle)]

or just a “Subtractive” property for the Light base class that has this effect, rather than creating a bunch more classes just for this.

[pauljkl]

Or just allow for negative brightness on regular light instances

[buildthomas]

That’s in the quote in alternative