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A light tube is an alternative representation of etendue in the phase space. They were first investigated by Zimmer, examples of various fields of optics were presented in. The search for a perfect illumination for a given optical system can be understood as a task to fill a light tube or its phase space with light. The way for illumination design starts with an identification of the relevant properties of the optical system which can be characterized via the light tube concept. The etendue of a light tube is calculated via Hottel's formula or its approximations for important special cases. Knowing the etendue allows for source selection. We show various design approaches – imaging and non-imaging - to adress this task.
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Henning Rehn (2024) studied this question.
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