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Old 02-21-2010, 11:51 PM #1
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Default My Eyes! My Eyes!

So I'm buying my first laser to make a fun light display synced to music. ( Just mount a mirror on a small speaker and aim the laser at the ceiling ) I'm wondering which of these is safer / brighter, a:

20mW Green DPSS laser module

or a

140-150mW 650nm Laser diode module?

Both from Sunclan Lasers

I think I heard that DPSS could injure your eyes quicker since they're pulsed. I'm planning on being pretty safe, but PERMANENT damage freaks me out. Am I being too worried for these 2 lasers?


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Old 02-21-2010, 11:59 PM #2
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Default Re: My Eyes! My Eyes!

Not all DPSS are pulsed, most are CW(constant wave). Green would be better as it is more visible with lower power so less damage potential, plus its a cool color.

Also you could get a 50mW module from O-like(way more reputable) for half the price of that 20mW module->http://o-like.com/index.php?main_pag...products_id=18
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Old 02-22-2010, 01:04 AM #3
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Default Re: My Eyes! My Eyes!

So a 50mW would be relatively safe? How long could that o-Like 50mW Green run, as far as heat goes? Would it need a heat sink to run continuously?
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Old 02-22-2010, 01:13 AM #4
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Default Re: My Eyes! My Eyes!

Get this "lab laser" module from Aixiz, it's super affordable, perfect power, and made to be run for long periods of time.

I promise you cannot go wrong with it, and they ship from Texas USA, The owner of the company is a down to earth really nice guy with a PHD.

The unit is fully guaranteed so no worries about customer service.

All you need is a 5 volt plug in adapter, readily available at most electronic stores.

Enjoy. And Welcome to the forum.

aixiz.com StoreFront Link

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Old 02-22-2010, 01:13 AM #5
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Default Re: My Eyes! My Eyes!

Quote:
Originally Posted by dhattman View Post
So a 50mW would be relatively safe? How long could that o-Like 50mW Green run, as far as heat goes? Would it need a heat sink to run continuously?
You should probably do some reading around here before you go buying a Class IIIB laser.
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Old 02-22-2010, 01:29 AM #6
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Default Re: My Eyes! My Eyes!

Brando132 needs to think twice about recommending such a high power to someone who is just starting out.
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Old 02-22-2010, 01:47 AM #7
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Default Re: My Eyes! My Eyes!

I wasn't saying he should be looking into the laser was I? he's using it for a light show on his roof not pointing it around which can lead to specular reflections. what I was trying to point out and maybe I should have been more clear, is that you can find way better prices if you look around a little. Sorry, maybe that is a little too much but that is what I started out with a dx true 20 that was more like 50mw.

*that unit photonaholic suggested looks perfect for his purpose.
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Old 02-22-2010, 01:56 AM #8
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Default Re: My Eyes! My Eyes!

Well basically that's what I'm wondering. Specular reflections: How bad would it really be (I'm not planning on being any less safe here, just wondering) if oops the beam hit the cieling fan brass and reflected into my eyes for a split second, any permanent damage?
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Old 02-22-2010, 02:48 AM #9
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Default Re: My Eyes! My Eyes!

Quote:
Originally Posted by dhattman View Post
Well basically that's what I'm wondering. Specular reflections: How bad would it really be (I'm not planning on being any less safe here, just wondering) if oops the beam hit the cieling fan brass and reflected into my eyes for a split second, any permanent damage?
If it is moving fast, No.
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Old 02-22-2010, 02:55 AM #10
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Default Re: My Eyes! My Eyes!

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*that unit photonaholic suggested looks perfect for his purpose.
Thanks!!! appreciated
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Old 02-22-2010, 03:23 AM #11
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Default Re: My Eyes! My Eyes!

Thanks guys. That axizis unit looks great!
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Old 02-22-2010, 04:05 AM #12
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Default Re: My Eyes! My Eyes!

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If it is moving fast, No.
Please don't give out this kind of advice. A laser is class 3b because it's power is high enough to do damage to the eye, faster than the eye can blink. So ANY reflection, no matter how fast needs to treated as a great hazard to the eye. When in doubt, wear proper safety goggles. Permanent damage is not always defined the same way.
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Old 02-22-2010, 04:04 PM #13
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If it is moving fast, No.
Wrong.
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Old 02-22-2010, 05:05 PM #14
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Default Re: My Eyes! My Eyes!

I've always found the 20mW to 50mW heck even 100mW to be a bit of a (what good is it) value... It seems that they are always to bright for any kind of inside pointing
and they really aren't that good at all for burning.

I would say for the OP that a 10mW would be good for this app. I know they still sell them, they are not that expensive and eye injury would be (although possible) just not on the blinding side.

What ever your choice is be careful none-the-less.
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Old 02-22-2010, 05:35 PM #15
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Default Re: My Eyes! My Eyes!

Plus if it hits something that nots flat like a brass screw on your fan, the reflection is going to spread out and dilute, so even less of the reflection enters your eyes.
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Old 02-22-2010, 09:37 PM #16
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Default Re: My Eyes! My Eyes!

15mW used on a spirograph is more than safe IMO. Normal scanners used in shows are far above there...
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