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Message: <blockquote data-quote="BeauNiddle" data-source="post: 1267487" data-attributes="member: 836">If you close the shutter I'd say there is no light visible (either to see by or to be spotted by). It's the simplest ruling.If you want a bad science explanation then say that invisibility doesn't make opaque things transparent, instead it creates a 'bubble' around the recipent and light either bends round it or quantum tunnels through it rather than travelling in the more standard straight lines it is known for. Inside the bubble normal rules of science are followed. With the shutter open the photons from the lamp leave the bubble and so are visible, with the shutter closed nothing leaves the bubble hence nothing is visible.</blockquote>