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Thread: Safety Guidelines for would-be builders of projectors

  1. #21
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    Quote Originally Posted by buffo View Post
    Before this flame-war goes any further, let's see if we can agree on a few things:

    1) I don't think there is anything intrinsically wrong with a trained laserist (who has a variance and event insurance) going out and bidding $500 (or some other absurdly low amount) for a laser show, undercutting the big boys. That's called competition, and everyone has to deal with it. So long as the quality is equal, I'm sure even DSLI-jon agrees with this premise.

    The problem, of course, is that trained laserists with variances and insurance already understand that at $500 per show, it's not profitable for them to do the show. They'd quickly go bankrupt. That's why they charge more.

    But a hack who buys a single projector off e-Bay (and who doesn't have a variance or insurance) can certainly justify a few hours of his spare time to earn an extra 500 bucks on a Friday night. After all, it's not like he's going to quit his day job... And it's these people that the pros (including DSLI-jon) are bitching about.

    Agreed. That's more than fair.

    2) Very few people (professional or otherwise) actually withhold information as it pertains to laser safety. If you have a question about laser safety and you ask it in an intelligent manner (displaying the fact that you've done your best to understand the issue before asking your question), you will almost certainly get the answer you are looking for, either here on PL or in person at a Laser Enthusiast's Meeting. (Or even at an ILDA conference, for that matter.)

    The problem is that some people ask questions without understanding *anything* about safety, and they expect everything to be just handed to them. Taking on a question like this often means accepting responsibility for answering *lots* of future questions. How many people are willing to invest the time needed to answer them?

    Also, some of these people asking these questions are the same ones who have no intention of ever getting their variance. They are only looking to learn the absolute minimum that *they* think they need to get by. Answering a question in such a situation is dicey at best, since you have no idea what their knowledge level is. In the worst case, you might end up encouraging someone to do a show that ends up being grossly unsafe. (See the ProDJallen thread for abundant examples of this.) And how does that leave the senior member feeling afterwards? Frustrated as hell, I can tell you.

    So, given that safety is a complex topic, where does a person draw the line? At what point do you decide that the extra work of explaining something two or three times becomes too much? After all, no one here gets paid for answering questions. We all donate our time.

    So how much is too much? And when it comes to the pros (who presumably have other things they could be doing to actually earn money), why bother trying to help someone who in all likelihood might end up underbidding them on a show in the future? (Especially if that person won't have a variance when they bid?) This is where a lot of the friction between the hobbyist and the professional communities comes from.

    OK, also completely fair. If, as a professional, you don't want to take the time to help by answering questions you've answered a thousand times, fine. I understand completely. That's no reason to dodge questions and point fingers at the so-called "hacks" asking them. Just don't answer. It's real simple.

    The solution is to ask intelligent questions, and to make an honest effort to learn as much as you can before you cry for help. In those cases, people will help you. I've *always* been able to get help when I needed it - even from people who make their living doing shows. But I don't ask about stupid shit that I could learn from a simple Google search, either.

    I've heard several people complain that we need a Wiki with all the safety information in it. And I agree this would be a great resource. But I don't have the time to pull it together. I'm already involved in *lots* of other projects related to PL, and there are only so many hours in the day. (I have a life too, you know...) If someone else wants to head this up, that's great. I'm sure several people will give their input to the project.

    Input is all we're looking for. Input over time, when people have the time.

    But I certainly don't *expect* anyone to do this, and I damn sure won't complain if no one volunteers for it. Because I understand that it will be a *LOT* of work, and if I don't have time for it, why would I think anyone else would?

    3) The "rite of passage" for laserists doesn't mean you have to grovel at the feet of the pros, but it does mean you need to work on educating yourself. There's nothing wrong with asking questions, but you need to show that you've at least done some research on the initial answers before you come back with new questions.

    You wouldn't believe the number of PM's I answer on a weekly basis. Some of them are sharp, inquisitive questions from passionate hobbyists who are completely enthusiastic about lasers and who are devouring every resource they can to learn more about how projectors work. I like answering those PM's, and I will bend over backwards to help people in that situation.

    But I also get PM's from people asking if I can fill out their product report for them and file it with the CDRH for them. Uh... No, I don't think so. First, I haven't finished my own product report yet, and second, if you haven't even looked at the form yet you have no business asking someone else to fill it out for you. (Unless you're going to pay them to do so, that is. And I am not in the business of filling out product reports! Call Casey Stack for that...)

    I'm sure that many members (including DSLI-jon, and probably Brian as well) have had to field requests similar to those I've detailed above. And I can tell you that it doesn't take very many of the second type to really turn a person off on the idea of helping others... That is probably why Jon is so sensitive to this issue. Truthfully, I'm getting a bit testy myself, and I'm still a relative newbie in this game.

    In summary, safety is not proprietary. It is complex, and answering safety questions takes time and effort, which not everyone is willing to donate. But if you do your homework and ask intelligent questions, you'll get your answers. Just don't expect people to spoon feed you - ever.

    I understand all this. I also find it commendable that you give good reasons for how you feel here. If you read over the "pros" contributions to this thread, you won't find any such reasons. Instead you'll find arrogant responses and both direct and indirect insults. Hats off to those guys. I'm sure they do great shows.. at least they have that to make up for crap attitudes and "holier-than-thou" judgmentalism.

    Adam
    15chars..........

  2. #22
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    Quote Originally Posted by ElektroFreak View Post
    I also find it commendable that you give good reasons for how you feel here. If you read over the "pros" contributions to this thread, you won't find any such reasons. Instead you'll find arrogant responses and both direct and indirect insults.

    In fairness to some of those people, it may simply be that they've been dealing with this sort of problem for a lot longer than anyone here on PL has. (PL is not the first laser discussion forum, though arguably it's one of the most successful, at least currently.)

    For the guys that were around when the LaserFX website was active, or for the ones who remember when alt.lasers was the main source of laser discussion, it could be that after a decade or two of the same old crap, they've become, er, somewhat "jaded".

    I'm not excusing them, just trying to shed some light on why some people act that way. As for me, I'm new, so I'm not a curmudgeon yet.

    I've also had the most excellent fortune of being included in some professional shows, where I could learn from people who really know what they are doing. So I do understand some of their arguments, even if I don't happen to agree with all of them.

    One thing I have learned is that it's very hard to make any decent money doing shows; at least if you do them correctly (with variances, insurance, back-up equipment, etc) that is. If you bid a show with an RGB rig center, and a pair of monochrome greens left and right, that means that you have to bring 5 projectors, not 3. And 3 controllers, not 2. Because you need a spare for everything. The show must go on, right?

    Factor in scaffolding, cabling, hoses, hazers, foggers, a disconnect box, skirting, and you're talking about an awful lot of gear to carry. Then consider travel time, hotels, meals, etc... It gets expensive!

    As an example, we once did a show for 2600 people in downtown Atlanta. We had an I-90 whitelight (figure 3.5 watts of white) with a PCAOM and scanners up on scaffold at center stage, plus a pair of 1 watt DPSS greens left and right running paired on a second controller and 12 bounce mirrors positioned in the venue. We showed up with a pair of Lexel 95 projectors as backup, plus an extra DPSS projector just in case.

    We had 200 ft of water hose to run, 120 ft of 3 phase power cable to run, 2 tiers of scaffold to set up, 3 controllers to set up (only needed 2 though), and just 3 people to do all the work. The gig paid $1500, and we all drove 5 hours (one way) to get there. The guy carrying the equipment (van + trailer) got 11 MPG for the entire trip because of the weight he was carrying.

    Was it worth it? Hell no, except that I did it for free just to see the lasers, and the other two guys did it because they love doing laser shows, and because they really wanted to see the headliner act (Tiesto).

    But was it worth it as a job? No way in hell. By the time you accounted for gas, food, hotels, and the event insurance, they didn't make much at all. Surely not enough for what ended up being 12 hours of back-breaking work for the 3 of us (not counting the 6 hour concert itself or the drive there and back).

    But they *did* put on one hell of a show... (And they still don't have the "holier than thou" attitude.) So there are some good guys still out there.

    I encourage those hobbyists who are considering going pro to try to partner with someone in your area who already has a variance. Do what I did - work for free; at least for one or two shows. Get your hands dirty and learn what doing shows is all about. You might find you like it, and if you do, they'll probably start paying you. Or you might decide that it's not worth your time... But the only way to know for sure is to try.

    Adam


  3. #23
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    First - Adam -

    Thanks for your cool-headed responses, and 'seasoned' viewpoint... I clearly had too much chili-pepper beer last night and was on some kind of warpath - or was it the 2 really-late Deposits still pending and still chasing a bad-check from Jan?? Anyhoo, I especially appreciated your 'street-wisdom', here:

    "Do what I did - work for free; at least for one or two shows. Get your hands dirty and learn what doing shows is all about."

    Excellent advice for the 'new crops' and I would be happy to all allow any PL-member to 'shadow' sometime, on one of our gigs (...and that just might even include you, sometime, St Louis...) PROVIDED THAT I don't have to explain more than ONCE to any would-be 'Tech' WHICH end of the extension cord goes WHERE - You'd be astonished just how many times I've had to show an "Electrical Engineer" or some guy with a 'degree' how to connect feeder to the mains - or how to use his DMM (!) - and I ain't an EE!

    But this is all waaay off-topic, so I'll 'wrap it up' - thanks for your efforts to 'mediate', however:

    Quote Originally Posted by ElektroFreak View Post
    That's all this thread has been about from the beginning. I stated my opinions, which I clearly stated were recently reinforced by statements from a well-known eastern european laser show producer...but you took it as if I was speaking directly to you
    Because your 'opinions' were / are offensive to the "Professionals" you were / are 'bashing' - and I am one of those such-like 'professionals', which you DID 'lump-in', all-together: (and I QUOTE...)

    Quote Originally Posted by ElektroFreak View Post
    There are a significant number of "Professionals", however, who will not be willing to help with this since they believe that many aspects of laser show safety are trade secrets and should be kept that way. ...but I can almost guarantee you that there are only very few truly knowledgeable members here who will help. ...but as for others.. I'm doubting it.
    ...and when I 'challenged your assertion' and asked you to 'prove it' - LIST the names and PL-IDs of all the 'significant number' of 'unhelpful, secret-guarding professionals' here on PL - you ignored it - At that point, you could-have replied with 'sorry, you may have misunderstood - I was MOSTLY talking about ONE European Co, that blah, blah, blah... " but you didn't - instead, you defended your 'opinions' - which I - and others - took offense to, since we DO spend a LOT of time on here - TO HELP. If you're gonna 'dish it out', you had better be able to 'take it'. (OR 'clarify'...)

    Quote Originally Posted by ElektroFreak View Post
    (interesting how that works - no guilty conscience syndrome there at all)
    Hahaha - yes, just because I don't buy your 'conspiracy theories', I am 'projecting a guilty conscience' about 'witholding helpful info'... ROFL - you should write stuff for TV, dude! ....OK, OK, you're RIGHT - I DID refuse to sell galvos to djLemon for his FrankenScope!! - I DID refuse!! WAAAAAHH!!! WaaaahhhAhahahahaa!!!

    Quote Originally Posted by ElektroFreak View Post
    It speaks volumes about YOUR professionalism. Let's also be sure to make a note of your "skillful" dodging of pertinent questions pertaining to safety in this thread.
    Ok, Your Holyness - cards down: Tell everyone here ALL about MY 'professionalism' - go on... you have all the answers, your Worship... Oh, and please - include a list of all the 'pertinent questions pertaining to safety in this thread' I have 'skillfully dodged' I seem to recall posting no less than 5 threads I contributed-to / started about Safety / tips helpful info, so ??? Just because I refuse to 'get down on my knees and smoke your pipe', does not make me 'unprofessional', got it, Freak?

    If you find that people are not 'throwing flowers at your feet' to help you - maybe YOU should re-consider your 'attitude' - simply SAYING you 'support a central source for safety info / helpful tips' from all the pros who have invested hundreds of thousand$ and years upon years of blood sweat and tears - does not automatically 'entitle' you to ALL the 'hand-holding' you wish - you can't BUY your 'stripes' - you have to EARN them - you can try - so-many do - but in the end, as Adam, X-Laser, Steve and McCarrot (excellent-point about the Power-meter, BTW, McC... ) so correctly pointed-out, there is no substitute for experience. Which you, good sir, insulted.

    End of rant, here. If you feel the need to 'continue', let's 'take it outside'...
    j
    ....and armed only with his trusty 21 Zorgawatt KTiOPO4...

  4. #24
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    I don't think I have ever seen show safety being treated as a trade secret.

    Now now to best deal with the paperwork, or where to get the best gratings, or how to get a particular effect, sure trade secret, but safety, I have never seen anyone try to treat THAT as a secret.
    That is NOT equivalent to saying that a busy man is going to document everything for you, but specific questions are very, very seldom a problem (and are almost never an issue where safety is concerned).

    The problem with a central safety information repository is that it can never be a simple ABC sort of list, so much depends on the details of what you are building.
    For example, my current project (an I70 with a hacked power supply) has entirely different electrical safety issues to something low voltage diode based, a site that addresses the radiation safety would quite possibly leave me with a dangerous machine because it failed to address 200V DC at 35 amps or so in a potentially wet environment.
    The only way to engineer a safe system is to UNDERSTAND that system, its failure modes and the risks associated with them, that is not something you can get from a wiki, for all that you might get the obvious radiation safety stuff documented there.

    Intelligent questions formulated on having done some background research (Library is often better then internet for this) will usually get useful answers from most pros, even if the answer is just a reference to a standard or a paper, what nobody likes doing is handholding people who have not done the background research (Time consuming and there are an unlimited number of such).

    FWIW I don't think I have ever seen Jon pull holier then thou attitude on this board, I don't doubt somebody has, but it certainly does not seem to be common.

    Regards, Dan.

  5. #25
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    Hey Dan! -

    Great to see you 'back'... I know you have had your hands full, there... Hope things for you / yours are going as well as 'can-be'...

    ...And thanks for steering this thread out of the shoals... ...again, 1000-apologies to its' author...

    Quote Originally Posted by DMills View Post
    The problem with a central safety information repository is that it can never be a simple ABC sort of list, so much depends on the details of what you are building.

    For example, my current project (an I70 with a hacked power supply) has entirely different electrical safety issues to something low voltage diode based, a site that addresses the radiation safety would quite possibly leave me with a dangerous machine because it failed to address 200V DC at 35 amps or so in a potentially wet environment.
    Yeah, excellent point - echos 'X-Lasers' sentiments:

    Quote Originally Posted by X-Laser View Post
    Ok - fair enough and I understand that completely - I was more reacting to the notion of having a document which could be edited by many parties many if not most of whom may not, for example fully understand the reciprocity given to the IEC standard, well partial reciprocity, under laser notice 50.

    I would suggest that such a document would need to be a guideline subject to interpretation and variation written by a very small number of highly experienced people. And, not for nothing, but most of the folks that I know who would really be qualified to write a summary of the regulatory framework make their living off of explaining it to people, like me.
    ...and, of course, there are the 'disparities' between Euro and US regs - and, oy vey - what to-do about the 'minefield' of audience-scanning', etc...

    Perhaps, it could be 'moderated' by those most 'seasoned', here (Steve Roberts, Greg Makhov, Pat Bish, clearly Yourself, the Doctor - could-almost 'ad infinitum', here... Maybe limit it to a 'council' of, like 12 'experts'?) but - then are we just bascially 're-inventing Sams' Laser FAQs'? / other 'info-banks', out there? How do we decide / Who decides 'topics'? Even if covering just ONE aspect - safety - as you've astutely pointed-out, there are so many 'angles' to safety - NOT just about beam-powers, etc... just yesterday, there was an excellent thread that got into 'fire-retardancy' reminders - Sooo many aspects... Truly, a conundrum...

    ...But, clearly, the 'voice of the masses' clamors for 'cake'... Thoughts?

    cheers..
    j
    ....and armed only with his trusty 21 Zorgawatt KTiOPO4...

  6. #26
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    As a relative newcomer to the safety issues, after being to a SELEM and reading many discussions here I have been impressed with the willingness of the professional leadership to propagate safety information. It's not only the right thing to do, but in the long run it's in their best interest as well.

    I support the idea of a safety instruction wiki, but to make this possible, feel its scope at least to begin with needs to be limited to a well defined set of conditions that need to be met for applicability.

    I'm far from an expert in the matter, but perhaps defining a set of these (most likely to be true and) required conditions for the document to be applicable will do a lot of good by simplifying the documentation process and guiding followers of the documentation in their construction of a safe system.

    Specifically, to make the project feasible, as a starting point I suggest the following conditions may be beneficial:

    1) Only solid state/dpss projectors
    2) No audience scanning
    3) Only projectors capable of an output UNDER class IV (requires further discussion)


    Given criteria like these, I think we might be able to reasonably assemble a set of construction, operation, and paperwork filing guidelines that, being within the limitations listed, would cover 99% of what most hobbyists want to do. This could limit the number of unlicensed 'friday night' operators and would leave no excuses for not filing, at the same time decreasing the likelihood of an incident.

    Those more familiar with what is required.. what do you think?

  7. #27
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    Quote Originally Posted by drlava View Post
    Specifically, to make the project feasible, as a starting point I suggest the following conditions may be beneficial:

    1) Only solid state/dpss projectors
    2) No audience scanning
    3) Only projectors capable of an output UNDER class IV (requires further discussion)
    4) CW only, no Q switching/cavity dumping.
    5) Directly air cooled (No water loops).

    The under class IV thing effectively rules out a LOT of the UK hobbiest market where a large fractional watt is commonplace (A few hundred mW of green and red, add a blue ray burner diode putting out maybe 100mw (Ick!), sure sounds like class IV to me).

    In fact looking at what most people ask for help with here, it tends to be solidly into class IV.

    Now there is class IV and class IV of course, and my 4 & 5 are designed to squelch the arc pumped solid state (Vag burner) end of class IV.

    We need to restrict to the projector itself as well, so as to avoid 'venue' issues (About which you can write whole books), and as I see it there are 3 major areas that need attention:

    1) Radiation safety.
    2) Electrical safety.
    3) Rigging and structural safety.

    Further the relevant standards do differ between countries (and the US has that whole UL thing going on when it comes to electrickery and rigging components), so even these are going to need separate sections by country/region.

    I am far from certain that a generic document is really possible (or actually a safe thing to attempt liability wise), but prehaps a page of links and references would be good.

    I don't think we can do cake in this matter!

    Regards, Dan.

  8. #28
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    Quote Originally Posted by mccarrot View Post
    For building projector all the safety information you need is in the EN60825-1

    For doing lasershows It all starts with a decent power meter, but most people spend all there money on high power lasers without investing in the right tools to do any measuring.

    How can you ever talk about "is it save" if you do not even know what your projector is putting out.

    So once you have a decent powermeter you can take your projector and put out a static beam. Now you can measure to irradiance (mw/cm2) at 1 meter, 5 meter 10 meter 20 meter 30 meter 50 meter etc. to get a feeling how the power of your projector is behaving.

    If you want to do audiance scanning and you do not have scanfail the maximum value is 2,5mW/cm with scanfail its 10mw/cm2

    Under the right conditions 100mW/cm2 can be acceptable (10xMPE)

    If you have experiment allot with all of the above please feel free to ask any questions.
    The big question on the other side is: How much power (density) is required to get a good visible beam? And I'm not talking free air, but not clouds of fog either. More like a hazer running during the gig.

    Quote Originally Posted by DMills View Post
    5) Directly air cooled (No water loops).
    I fail to see what this has to do with audience safety (as far as laser exposure is concerned). If a coolant loop fails, and would trigger a potential runaway in power output, I guess a protection circuit would shut down the laser FIRST (to protect the laser) and possibly keep cooling the unit on open-loop reserve.
    Last edited by Stoney3K; 04-28-2010 at 05:24.

  9. #29
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    I fail to see what this has to do with audience safety (as far as laser exposure is concerned). If a coolant loop fails, and would trigger a potential runaway in power output, I guess a protection circuit would shut down the laser FIRST (to protect the laser) and possibly keep cooling the unit on open-loop reserve.
    The objective was to limit the scope to the low end of class 4, as the alternate to limiting the scope to below class 4.

    Otherwise we have to try to prep something that covers things doing multiple tens of watts as well as the hobby stuff doing ~1.5W, and some of the risks do change.

    Dealing with a vag burner doing ~10W CW is not appropriate for this sort of document.

    Regards, Dan.

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    Quote Originally Posted by DMills View Post
    Dealing with a vag burner doing ~10W CW is not appropriate for this sort of document.

    Regards, Dan.
    I was thinking more along the lines of a couple-watt Ar/Kr, like a SP165 or 168.

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