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As previously mentioned, opaque projectors need hotter bulbs and larger bulbs than the average projector. Because of this, it is important that you not leave a drawing or object you want projected onto a wall or other surface in the projector for prolonged amounts of time. Your object will get very hot and could be damaged. Please know that you should take your item out of the opaque projector from time to time to ensure that you are not damaging it.