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Old 03-18-2011, 03:57 PM #1
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Default OD 4+ Is too much for a 200-300 mw red?

Hi to every one,
Im new in this forum and this is my first post,

Just to u know, I live in Rio de Janeiro, Brazil,

I already got some crapy lasers and after found this forum my interest in laser just grown a lot :P

Before i get any Hi power laser i want to buy a good protection...

My intention is to buy first a red burn laser, one of those:



Cute High power 300mW red laser torch/focusable - O-Like
Cute High power 300mW red laser torch/focusable [OL-CR-250] - $59.99 : Welcome to O-Like.com, Your source for laser products



DX Dilda 200mW red
$27.09 - High-Power 200mW Red Laser Pen (Burns Match + Visible Beam Daytime) - Red Lasers



If u got any other good sugestion i would be grateful. I dont had any skils whith eletronics so i dont believe that i culd build my own laser (Im a lawyer)


I had look in to OD calculator, and for 300mw reduced to 1mw they recomend a 2,5 OD

I had found these goggles:



laser 2 go - OD+ 4 for RED
Protection Glasses for 650nm Red Laser



Dragon Lasers - 600-740nm - OD>4 @ 621-740nm
Laser Glasses - Red laser beam protection 600-740nm :: Laser Safety :: Dragon Lasers



Eagle Pair - 580-760nm OD4+
Red Laser Safety Goggles Glasses Protection 635 685 New - eBay (item 270719320809 end time Mar-19-11 19:01:43 PDT)



Again, any other suggestion will be welcome. Of those aborve the cheapest to me would be the laser2go (due to shiping to brazil)

All of them are 4 OD goggles... here is my question: I still be able to see the dot? I will be able to see what im doing ?


Sry for the long post and for my bad english,

If i had done something wrong please tell me,

Grateful for your attention,
Andr Eduardo


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Old 03-18-2011, 07:07 PM #2
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Default Re: OD 4+ Is too much for a 200-300 mw red?

Glad your buying eyewear for you first high-power laser. I don't think 4+ OD is to much, I've used my OD 7+ goggles with a 50mW green and it is very hard to see the dot, but it still works. That being said, the goggles I own are ment to be used for 445nm blue lasers but still work up to the 532nm green spectrum.

OD 4+ should be fine for a 200-400mW 635nm laser.

I would reccomend getting a second opinion (from someone who is more experienced) though as I have only been into the laser hobby for a year now.
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Old 03-18-2011, 07:38 PM #3
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Default Re: OD 4+ Is too much for a 200-300 mw red?

Hi!

I think that for this red lasers that you have post, OD 4+ is enough.

Also, I think that is necesary that the googles fit well in the head and that block any small hole. It seems silly, but sometimes the glasses do not fit quite right, either because they are too large, and this cause that the light in between and eye damage is very probably.
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<100mW 532nm Genuine NewWish Compact
<50mW 532nm Genuine NewWish Focusable with Key

Safety Googles OD = 4+ Eagle Pair 532nm, 405nm and IR
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Old 03-18-2011, 10:23 PM #4
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Default Re: OD 4+ Is too much for a 200-300 mw red?

A few tens of microwatts is still very visible, so OD 4 would be fine. With green lasers there is fluorescence that gives away the beam, red laser usually don't do that.
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Old 03-19-2011, 11:48 AM #5
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Default Re: OD 4+ Is too much for a 200-300 mw red?

I would like to thank all the answers !

So i culd buy the goggle from laser2go that im gona be fine? he looks like solid and looks that gona fit well whith a good blocking out of the lenses...

Any one had references about the company (laser2go) and the goggles (Protection Glasses for 650nm Red Laser) ?

My only concern about that is the wavelength that this covers (632nm - 650 nm) some reds are about a litle high then that... like the o-like ones: 650+/-10nm


Again, Thank you guys...
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Old 03-19-2011, 02:39 PM #6
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Default Re: OD 4+ Is too much for a 200-300 mw red?

There is no OD graph available, the goggles from laser2go are probably not even measured to have the OD they claim. If they work from 632-650nm there's a good chance they work a bit further. But you'd have to test the OD anyway. There is probably a review of the goggles here on the site, that should give an indication of how good they are.
I still recommend certified goggles, but that's probably not an option considering your budget.
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Old 03-19-2011, 04:32 PM #7
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Default Re: OD 4+ Is too much for a 200-300 mw red?

Thanks Bluefan,

I had done some researchs and dont find any reviews about the laser2go goggles ...

My next option would be from dragon laser ( Laser Glasses - Red laser beam protection 600-740nm :: Laser Safety :: Dragon Lasers ) about this goggles especific i do not find any reviews , but about the others goggles from dragon laser i found many people speaking good things.

For the Red laser whith that power im not interest in buy a OEM goggles, because the cost whith shiping gona reach $100 to $120... and then plus $80 +or- for the laser from o-like, but my eyes worth more then $120, i just do not want to waste money ...

When i look for a 1W+ blue or a Hi-Green I will definitely buy a realy good one ...

Grateful,
Andr Eduardo
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Old 03-19-2011, 10:29 PM #8
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Default Re: OD 4+ Is too much for a 200-300 mw red?

The dragon laser goggles have specs that are confirmed by measurements, I'd recommend them above cheap china stuff. The dragonlaser goggles are popular because people know what they buy is verified to be good, which is the whole point of safety. In a professional situation certification is what guarantees this, but not every laser hobbyist needs that.
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