'Draw a "transparent" triangle over dark background in monogame

I am trying to have a "night" effect on my screen, by setting dark background

spriteBatch.Begin();

// my objects here

spriteBatch.Draw(darkBackground, Vector2.Zero, Color.White);
spriteBatch.End();

and then drawing a transparent triangle ("flashlight")

GraphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleList, vertexPositionColors, 0, 1);

How do I make my triangle to "clear up" the background, without affecting my other objects. I was trying to do it with BlendState, but not could not make it working

c++sharpmonogame


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