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Some light guides have a low index of refraction and can be made of, for example, Teflon, acrylic, or PMMA. Light guide 50 may be in contact with light emitting device 1 or can be spaced apart from light emitting device 1 with, for example, air, silicone, epoxy, one or more filters, or a coating such as an antireflective coating between light emitting device 1 and light guide 50.
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