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Need Insight Here Please

L

lightningz

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Hello to all. Okay, here's the deal. I am not only really impressed, but, also flattered as to how so many members take safety seriously - Double Kudos to those who are advocating the importance of this matter. I essentially have suffered "information overload" now in my quest to obtain a pair of quality / certified safety glasses to use when operating a 1.5 watt 445nm laser. Unless I'm not understaning correctly, most are recommending at least OD7 - Is this overkill? Please don't get me wrong, my eyesight is not negociable! So, I will do whatever it takes to secure their protection. However, I want to make the best informed choice as well. At this level, will I be able to see the beam at all (i.e. visible light transmission)? And, is it okay to go with a multiple wavelength pair of glasses. Ideally, I would like something that offers soem degree of peripheral vision protection too. Given the magnitude of this post, I am deferring to the known experts on the forum. In anticipation of your information - Thank You :)
 





InfinitusEquitas

InfinitusEquitas

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See the links in my signature.

Go with the OEM Laser Systemgs ARG goggles... certified proteciton for 405-532nm. You can select a style that does offer protection from the sides.

You will not be able to see the beam at all. The point of goggles is to setup the laser safely or to handle it safely to where you're 100% in control. after that you can take off the goggles and enjoy the beam/dot:)
 
L

lightningz

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Very well :) I'm starting to surmise that if you can actually see the beam then you are not being afforded protection - Is this accurate? As far as these glasses go, is OD4 enough in terms of protection (I'm only qualifying this because, as I stated earlier, I am not an expert by any means but have read here on the forum that OD7 was apparently the way to go). Also, what exact are they referring to when they outline "exceptional VLT transmission at 50%? Thank You :)
 
InfinitusEquitas

InfinitusEquitas

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OD refers to optical density....

For a 1.5W laser you need at least ~OD2.5, preferably OD 3+.

VLT refers to the total amount of light int he visible spectrum (Visible light transmission), that is allowed to pass through. Meaning that overall, these will pass through 50% of light, except at the wavelength ranges specified, where you're protected.
 
L

lightningz

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Okay, these are OD 4+ which should be fine then; Is it preferable to have more Visible Light Transmission, or, less? If it is indeed more, what is the maximum possible? Lastly, does the VLT have any impact on other safety aspects?
 
L

lightningz

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Looks like its only you and I volleying this one back and forth InfinitusEquitas :D Incidentally, I do like your moniker; The name of our band is INFINITE TONE :) Please do believe that I am not being parasitic here in rendering these questions; I've gone through over 100 pages of varied literature and really felt the needed for some qualification now. My sole objective is to make the best choice, that's all. We only have one set of eyes..... Given that I am neither a physicist nor an opthomologist, I'm not grasping the notion of VLT and why 100% would be the ideal. Was I incorrect when I stated that "I'm starting to surmise that if you can actually see the beam then you are not being afforded protection - Is this accurate?" Cheers!
 
InfinitusEquitas

InfinitusEquitas

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VLT means the total amount of visible light coming through...

100% VLT would mean that all visible light is coming through. Which means you would not be protected against anything (445nm is visible).

So you can't have 100% VLT and protection. The higher the VLT rating is though, the more light is passed through, from the rest of the visible spectrum... from what's not being blocked.

If you see a beam through goggles, you are not being protected.

Basically you want high VLT since you're more likely to be aware of the environment overall. Some goggles for example have very low VLT but cover more wavelengths... I'm not a fan because they are too dark to work in though. With ~40-50% VLT you can still do stuff.
 
L

lightningz

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Now that's the common sense answer I had been seeking here :) Thank You! So, is 50% VLT ideal or should I attempt to seek higher? And, anyone have direct experience Survival Laser and these EaglePair saftety glasses? They're supposed to be CE Certified and I don't want to be taking any chances.......
 
InfinitusEquitas

InfinitusEquitas

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They aren't certified, (more china BS, what else is new?) but they do work very well. I use them myself (the slip over glasses version), although I also have goggles from OEM.

For 1.5W of 445nm they will work great.
 
GAtkins

GAtkins

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@IE, just want to clarify something here.

Did you mean to say that one could look at the dot of a 1.5W 445nm on an indoor or any other surface without goggles?

Just checking my friend....

Glenn


InfinitusEquitas said:
See the links in my signature.

Go with the OEM Laser Systemgs ARG goggles... certified proteciton for 405-532nm. You can select a style that does offer protection from the sides.

You will not be able to see the beam at all. The point of goggles is to setup the laser safely or to handle it safely to where you're 100% in control. after that you can take off the goggles and enjoy the beam/dot:)
Click to expand...
 
L

lightningz

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Damn! I thought that these were the real deal...... That does suck! Unless I'm mistaken, the OEM's are at least double the price - But well worth it as far as my vision is concerned :)
 
L

lightningz

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GAtkins, I'm at a loss as to what you are referring to here - Is it indeed taboo to look at the dot of a 1.5 watt laser indoors without glasses???
 
J

joeyss

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Depends on the distance and what it's on. At 1.5 watts even specular reflections can cause damage.
 
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