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Old 05-22-2012, 01:28 AM #1
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Exclamation Is it normal to see color?

For my first laser, I bought a pair of cheapies for 5$ for 532nm. Works perfectly, while bleaching the color right out of the dot.

I'm building a 1W 445nm (probably will set it < 500mw) and I'm iffy about the glasses I just bought.

I have a 4$ purple laser pen I bought on ebay with my ebay bucks, and I can see the complete purple dot.

What has me baffled, the cheap glasses take more color out of the dot than the 35$ ones I just bought (OD 5+/6+)

Is this normal or do I have defective glasses?


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Old 05-22-2012, 01:34 AM #2
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Default Re: Is it normal to see color?

It all depends on what wavelength your safety glasses are rated for.

Some (more expensive) pairs will cover a wide range of wavelengths and others will only cover a narrow band.

Be careful though with your 532nm laser though as your goggles may block the 532 light but may not block any of the IR light.

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Old 05-22-2012, 01:40 AM #3
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Default Re: Is it normal to see color?

The cheapie ones are rated for 532nm. I have an IR filter on my green laser, anyway. The expensive ones are rated for 405-532nm.

cheapies
New Protection Goggles 532nm Green Laser Safety Glasses | eBay

expensive
Laser Safety Goggles OD+5 OD+6 405nm 445nm 532nm | eBay

Im a newbie in the field of eye protection. What does it mean when color passes through, while sometimes it doesn't?
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Old 05-22-2012, 01:47 AM #4
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Default Re: Is it normal to see color?

I wouldn't use your cheapies for a >500mW blue laser.

What green laser do you have?

It's all about how much of that light passes through. If the dot is painful to look at without your glasses, but only a dim dot with them on it's blocking a high percent of the light. With higher powered lasers more light passes through the glasses.

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Old 05-22-2012, 01:53 AM #5
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Default Re: Is it normal to see color?

I have a 132mw lazerer.

The cheapies look like it blocks more light then the expensive ones :/
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Old 05-22-2012, 02:04 AM #6
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Default Re: Is it normal to see color?

Because the cheepies are only blocking a narrow band of light they may block more. You would have to do tests with a LPM (Laser Power Meter) to accurately tell though.

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Old 05-22-2012, 02:07 AM #7
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Default Re: Is it normal to see color?

First picture is the cheap goggles.
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Old 05-22-2012, 02:16 AM #8
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Default Re: Is it normal to see color?

Cheap vs 35$ on 405nm

(lens was over the camera)

I just don't understand >< are goggles supposed to behave like this?
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Old 05-22-2012, 02:29 AM #9
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Default Re: Is it normal to see color?

After doing some research, the goggles I bought off of bogart are crap. T-rex is a bad brand. Off to find quality ones now.
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Old 05-22-2012, 03:42 AM #10
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Default Re: Is it normal to see color?

Grab these...

Eagle Pair 190-540nm Standard Laser Safety Goggles

Discount code for 10% off....

LPF445
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