Author Topic: Red glasses  (Read 827 times)

Stonemull

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Red glasses
« on: May 11, 2017, 11:43:45 PM »
I have a pair of these arrived this morning and just got to try them out a little. If link dies .. they are red goggles with identical manufacturing to our green goggles.

https://www.banggood.com/PC-Material-Adjustable-Laser-Pointer-Eyes-Protective-Glasses-p-979723.html

I think they might be up in the OD4 range at our wavelength, the spot on low power mode is JUST visible, not a great deal brighter than using my arc welding googles.
Since I was looking at a reflection off of something I was not sure it was even the wavelength I was seeing or some other frequency, so I experimented further and pulsed the beam at different powers with the goggles between the laser and a piece of white paper.
At a power of 100, the dot is just visible on the paper, at low power mode nothing at all gets through so it was not the laser wavelength I was seeing reflected at all.
So that is one he** of a reduction.

I think these are safe to use..

edit: during the above tests I was wearing the green goggles, I have since redone the tests onto paper with the naked eye (carefully !)
A laser power of 40 does get a visible spot through the goggles, it also gets through the filter from my arc welding goggles though.

I honestly think these things are like OD6+ at 445nm.



« Last Edit: May 11, 2017, 11:58:05 PM by Stonemull »
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ameersh

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Re: Red glasses
« Reply #1 on: July 12, 2017, 02:22:36 AM »
I have 445nm 5.5w blue laser machine from gearbest

I bought these red glasses after I read that red glasses are made for blue laser.

Is that true? Just to confirm the info

Note: even with glasses a try to avoid direct sight to the laser just sneak peeks from time to time.

Stonemull

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Re: Red glasses
« Reply #2 on: July 12, 2017, 02:44:15 AM »
I have watched the beam directly with these while cutting with no ill effects, no scratchy eyes. I would not even glance at it with the green specs.
I also use these when using my plasma cutter, I think you will find they are OD5+ in the UV/blue .. ie, cut out 99.999% or more of the beam.
If you look at any full on laser safety glasses for 545nm you will find tge majority are red or orange.

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Lob0426

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Re: Red glasses
« Reply #3 on: July 12, 2017, 11:35:52 AM »
I have the red and they definitely cut more light than the green. I have trouble seeing the beam. I more have to watch the burn. Th beam is near invisible.
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Stonemull

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Re: Red glasses
« Reply #4 on: July 12, 2017, 02:41:39 PM »
I based my OD 'guess' by comparing the spot intensity at lower powers on a reflective material against what I could see with my arc welding mask on.
The welding mask is darker by only a bit and that is OD10 so I am pretty confident 0D5+ is a very cconservative rating.
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kibodwin

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Re: Red glasses
« Reply #5 on: July 14, 2017, 02:43:13 AM »
From the little I know I am under the impression that the green glasses block only about 40% of the.light where as the red ones block about 60%. From very basic test I think this to be true. For me the red ones are much more comfortable and I only use the green ones for protecting the webcam I sometimes use.
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Stonemull

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Re: Red glasses
« Reply #6 on: July 14, 2017, 04:57:16 PM »
Thats across the entire spectrum, which is totally irelevant.
The inportant oart is that the green ones block maybe 90% of the laser and the red block 99.99%+

ie green dangerous, red safe.
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