Correct me if I'm wrong, but this looks unsafe. Video

[steven850]

Looks to me like the MPE is well exceeded by the look of the beams here as well as the time spent in the crowd. Especially the blue hot beams.

https://www.youtube.com/watch?v=Bv2WUAp1GhA

[gottaluvlasers]

It is near impossible to judge safety from an online video. Not to mention, the systems (it seems) are only ~1.5W from the description in the title. I have seen videos that portray safety questionability 1000X worse than this video. Those Lasers in your referenced video could be 1.5W or they could be 15W. You cant tell from Youtube videos. You cant see accurately, speeds of effects, diameters of beams, distances from audience to lasers...etc.

[buffo]

That discoscan lens that Pangolin sells really will make a difference. Aaron brought one to FLEM last year, and we goofed around with it. On his 1 watt spectrum, it went from being uncomfortably bright to even catch a 'flash' at a distance of 30 ft to being dim enough to stand in the scanned beam with no ill effects at the same distance. True, not an accurate measurement of safety, but it did seem to make a considerable difference. (Someone else did take power measurements, but I don't remember the numbers, nor am I positive that they used a 7 mm aperture, so even if I had the numbers they wouldn't mean much.)

That being said, some of that video appeared to have been shot with the lens in place, and other portions looked like there was no lens installed. (The beams look very thin in some shots, which would mean the lens was not installed for those.) I wonder if the "no lens" effects would be safe or not. My guess is, not, but as Marc said, there's no easy way to judge distance or divergence from a video, so it's difficult to say with certainty if the show was eye-safe or not.

Adam

[norty303]

Well according to the video title it's a Kvant Spectrum 1.6W, although they have had various different specs afaik.
I didn't really see any single hot beams, but did see finger beams and they were moving. Remember that the total exposure timeframe could be the same as for a scanned pattern.
I wonder what the losses are like on those discoscan lenses, and whether they affect divergence at all?

edit: seems Adam covered a bit of this in his post... must type faster!