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The bulb does not have a lamp shade, but it does traditionally have a cage that surrounds it so it is harder to break. It is called the Ghost Light. It's practical purpose is for emergency lighting, for example, so a hapless cleaning person does not fall into the orchestra pit. Some believe that it protects the stage from theatre ghosts. However, it gives birth to more shadows than a dark theatre does.

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Q: Why is one bare bulb always left burning on stage What is it called?
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