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Attached is the file from the University of Chicago Radiation Safety Office with the math, see section 3B Again, and Again, and Again, I must stress that proper laser safety above class 3A requires math and measurements. Yes, Diffuse laser reflections can be a hazard, and by definition some...

21 CFR 1040.1 still applies. All you are doing is technically reducing the hazard to Class I levels, and CLASS IV lasers in consumer goods are tightly regulated by CRH/FDA. Many companies have made the argument that if their beam is totally enclosed they are not marketing a laser device...

Quote ". Regardless, diffuse reflections don't cause eye damage" Like hell they do not. You can create eye damage with a diffuse reflection, for example, one of my 10 watt argons at work had a measured minimum safe distance of three meters from the spot on the wall. Steve

My office floor tiles have a few pink sections. Stray R6G powder is like the Spanish Inquisition, No One Expects it, and really stains everything. :-) Bleach, Alcohols, Acetone, Xylene, nothing will fully de-color the tiles, and the more you scrub with chems, the more it changes to pink...

Years ago it was done in the IR with very high gain dyes and very tiny outputs and far red or IR diode pumping. For years I've been explaining why this is very difficult in the visible, needing a flowing jet, 200 nanosecond transfer time, quenching, spot size from the diode, triplet state...

Working at a College, I can tell you DHS mandates a minimum of one sworn peace officer per 1000 persons at large public events. Your seeing the regulatory backlash from a eclectic event getting too large. It has always amazed me how Black Rock City and the corporation behind BM always got...

Been watching the Hong Kong political protests lately? Lasers made in China might get regulated much quicker if that "Political" use keeps up. Not that I have a problem with securing liberty, but I can think of better ways then flash blinding riot police. The Authoritarian folks might reduce...

OK..

When a friend went and got his audience scanning package together over the past year, the largest number of variances he could read online, for Aud Scanning were issued to Mega Churches. Followed by a few amusement parks. They at least have the funding, large enough venue, lawyers...

I have a peer judged award, 3rd place internationally, for ONE audience scanning show, done with a former partner. I can legally view my own show in Canada, but not in the US. That was back in the late 1990s. My CANADIAN mentors checked and rechecked that piece before it was screened. A...

We use Zones in hardware and software that reduce the power below the "zero" or horizon line. Scan Failure Safeguards (Required in the US) Wickedly expensive hardware, we own calibrated laser power meters, oscilloscopes, fast photodiodes set up to mimic the eye, years of training, legal...

Skytracker lamps are the major expense, 675$ per lamp for a 2KW XBO... 1500 for a 4 KW XBO rated life about 2500 hours... Which means you probably get 1800 hours.. Plus the cost of keeping the mechanics running. Looking at them on Ebay, neither they or GE /Sperry Searchlights go cheap. Steve

The variance is yearly, and FAA has nothing to do with the standard variance, , the outdoor approval is on a case by case advance notice basis. I no longer have to report indoor shows in advance unless I am conducting some very specialized effects, I do have to file my annual report. Now if...

See FAA 7400.2, Chapter 30. High Intensity Light Operations The arc light exemption is gone if your near an airport... Those guys are learning that they need to file, too. Generally FAA handles "clearing house" for laser shows. My two friends who do this on a weekly/monthly basis do not...

Form FDA 3635 “Laser Light Show Notification” Form FDA 3636 “Guide for Preparing Annual Reports on Radiation Safety Testing of Laser and Laser Light Show Products” Form FDA 3637 “Laser Original Equipment Manufacturer (OEM) Report” Form FDA 3640 “Reporting Guide for Laser Light Shows and...

When Patrick or his minions typed that, they deviated to what Patrick might have had in the past. If your taking an entertainment product on the road for sales demos, it was/is two variances and a product report. For the rest of us, it is a product report and a variance. In the old days it...

OK, Lets clarify a few things. One, even if terminated, your shooting into airspace for your project: Means you need to file an FAA report. Due to a recent act of congress on Drones, FAA pretty much covers down to the surface now. Two, its not "two" variances, it is a variance and a...

I have image converter tubes with long response cathodes, but that's just me... Steve

Most cameras do not see anything longer then 930-940 very well. Unless your using NVGs, long wavelengths have poor response on anything with a silicon sensor. I'd avoid 1050 nm or longer, period. I frequenty work with 1064 and now 1080, and Silicon barely sees it. Steve see...

Actually your possibly opening yourself up to a weak but possible felony charge if you don't take steps to register. GO read the lasers in airspace portion of the FAA Modernization and Reform Act of 2012 and tell me it's not a poorly defined catch all law. It scared some of us who have/had...