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i think that kids are stupid.....laser at a party...






It is important to know how long and at what power any of the laser
beams would shine through a 7mm diameter spot...
If it is below pre-established acceptable limits for legal Laser Shows...
then the laser show was safe...

If not... it wasn't safe..

Jerry
 
As long as the beam scans at a sufficient speed and the peak power (pulsed: bad) is not too high, there's little risk of damage to eyes. The only slight risk is if the safety mechanisms are bypassed - normally, if the scanner part breaks down the beam is cut off, but if this fails and the scanning section stops, it's as dangerous as firing a beam into the crowd. The only other risk is if you scan with a pulsed laser, since the peak intensity could be enough to cause damage, even for the tiny amount of time it scans over the eyes.

Normally, audience scanning is done with a lower power, and higher-power beams are reserved for areas over the audience's head. This way, there's little chance of eye damage, and the beams still appear as bright because of the smaller angle. Of course, with older crowds, you have the risk someone throws something reflective into the higher-power region above the heads of the audience.
 
lol, I have bought a 30mw laser and made my own insane DMX patterns with it, and it kicks, people are tripping out on it.
like charliebruce said, "beam scans at a sufficient speed" my does, but my laser is pulsed, some times, to get a spitted beam affect..like for example, 3 independent lines, then it looks just like 3 lasers, all in one, but the beam gets weaker then.. :-(
 
When I say pulsing, I mean modules which average, say 250mW, but do so by pulsing between 1W and 0mW, where the 1W burst happens for 1/4 of the time. In that 1W peak, if it scans over someone's eye and is sufficiently focused, the peak intensity might burn the retina, whereas if it were 250mW all of the time it would not do damage. This is a simplified explanation, but I hope explains the point sufficiently. This is slightly different to when you blank the beam to make a dotted pattern, since the peaks in this situation are no higher than the rated output of the module (in my example situation, 250mW).
 
hehe yip, its blanking, my bad...yea a 1W pulse on someone's eye, would be very bad
 
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