What is the minimum height I can project without it to be considered as audience scanning?

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What is the minimum height I can project without it to be considered as audience scanning?

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HSG95 states that installations should be designed so that the any point less than 3m above and 2.5m laterally from any location that the public has access to should not contain laser radiation that exceeds the MPE level. If the projection area has a raised floor or podiums, the 3m measurement is to be considered from the floor of the raised area.

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