Last year they made me take down my interlocked RGB projector which was located at well above eye level and pointed at a wall, so I definitely won't be bringing it this year.
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Class-3: Will cause eye damage. Class-4: Will set shit on fire. There are also subclasses. Most important for laser projectors: 3a vs 3b vs 3c. 3a is: Eye damage on direct exposure. 3b: Scattering off polished surfaces cause damage. 3c: Scattering off dull surfaces cause damage.
Class 3 and 4 and their subclasses are all but useless. The actual result depends way too much on the specific circumstances. Obviously my class 4 laser projector neither sets shit on fire nor is harmful when scattered off a dull surface.
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And it's also below eye damage levels when scanned at appropriate speeds and distances (though you wouldn't want to *deliberately* aim it at people, i.e. audience scanning, without more thorough analysis as the safety margins are larger for that)
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Just to reiterate: In our research we're scanning the laser, too, yet despite that we put a lot of emphasis on keeping the power safe for a static spot. The reason why? Nobody really knows if damages scales linearly with exposure time. It's ongoing research.
End of conversation
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