My question is how to detect if any of sprites in the scene is affected by light node.
Didn`t found anything related to this issue. Is there some delegate method like didBeginContact for SKLightNode?
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When you create a SKLightNode you set its categoryBitMask just as you would with physics bodies.
SKSpriteNode has a lightingBitMask property which you can set to determine whether this sprite is lit by a light node or not.
SKSpriteNode has additional properties regarding SKLightNode such as shadowCastBitMask and shadowedBitMask which deal with the sprite casting a shadow and being hidden inside a shadow.
Be aware though that the SKLightNode currently has a confirmed bug. Look at this SO question for more information.
