Change to US rules - how many of you missed this? (I did...)

[mccarrot]

Therefore for light show applications there is 60825-3:2008 (£80), which is a guide produced specifically for our sort of usage, and this is definitely worth a read.

This last document is available free of charge to ILDA members I believe.

Please share it with the poor people, ILDA member. please.....

[platinum]

I wouldn't be against someone letting me look at a copy, via PM or something.

[platinum]

It has gone so far now that we are interfering with Darwin's natural selection. The *idiots* that *should* be dead from electrocution, severed heads, disembowelment etc. are now being kept alive by idiot proofing and are walking amongst us and our children

I almost put that in my signature. Nicely put!

-Jonathan


*edit*
Oops, lost track of my browser windows there and double-posted for no good reason.

[Doc]

Guys; I dropped a hint but it didn't work, so I'll just say it. Check the ILDA swap documents folder.

[allthatwhichis]

But.. which one...

[platinum]

But.. which one...

I panicked and downloaded the whole directory.

-J

[buffo]

Thank you Doc, for your contribution that I will not speak of for fear of alerting the wrong people. I agree that it is completely unacceptable to charge people to get a copy of a standard that they are legally required to comply with.

As for the idea of omitting a shutter from a laser PROJECTOR, I think this is a bad idea, and Casey stack agrees. Having a shutter on a hand-held laser is reduntant - you've got the power button in your hand. Having one on a large frame ion laser makes sense, however, because the power supply might be 20 feet away from the aperture.

Likewise, having a shutter on a projector is a good idea as a secondary safegard against a software failure. It also allows the lasers to be warmed to operating temperature while preventing any emission. (Always useful when you don't want to give away the surprise of the lasers' presence!)

James:

Thanks for your input. I spoke with Casey about having him attend a Laser Enthusiast's Meeting, and he was open to the idea - provided we would cover his expenses. (Which is reasonable, since like you he basically earns his money doing Laser Safety work.) He actually talked about doing a 3 hour presentation on Laser Safety, and then another one on CDRH regulations and variance applications. I think it would make for one hell of an interesting day, but we'd probably have to get at least 20 to 30 people together to make it cost effective. I'll have to see what I can come up with.

I agree with you that Casey is very experienced in this industry. I knew him only by reputation, but after talking with him for nearly 90 min (and having him spout chapter and verse from both the IEC and CFR regs from memory) I have even more respect for him. He also has some fascinating stories about the early days of the laser show industry (and ILDA). Sure wish I was closer to him (he's in Utah)...

As for the IEC standard itself, yeah the 60825-1 standard (for manufacturers) is the one we were most concerned with, as it is the one that Laser Notice 50 allows manufacturers to use in lieu of portions of 21 CFR 1040.10. However, you make a good point about the applicability of the others. I'm going to have to spend some time reading through them over the next few weeks.

Adam

[300EVIL]

WOW! Thanks person in which will be left unnamed to protect the innocent!

[mccarrot]

Thanks for the tip Doc.

I was reading the EN 60825-1. chapter 4.11 is about a scanning safeguard.

If I understand correctly you only need scanning failguard if a scanner failure will allow exposure above the laser class (AEL).

This confuses me, so If I rate my 0,5W laser as class 4 I don't need a failguard, because a static beam will always be within class 4 or even 3B.

Am I reading this correct?

[buffo]

You only need scan-fail if you are audience-scanning. If the beam can not enter the audience even upon a scanner failure, then there is no chance of exposure - period.

A hard mask on the aperture of the projector that will prevent beams from dipping below 3 meters above the highest point in the audience even if the mirror falls off the scanner is just the ticket.

Adam