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Old 02-26-2013, 06:15 PM #1
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Talking Green Laser Help!

Hello everyone!
I would like to buy a 200mW green laser to use it only in open areas , like sky ,at night. This version have a LI-ION acumulator Ultrafire 2400 mAh 18650 type ( clasic ) .
It's safe to look at the beam? I mean , there are like 10-15 people around me and I don't want to damage our eyes.
This laser I'll use for presenting constellations.
Do I need to buy glasses ?
Sorry for my bad speaking but I'm not a native speaker of English .
Thank you for replies.


ps.: Tell me ,please, if a 500mW laser it's safe to use it outside without glasses. Thank you !



Last edited by Cosmin; 02-26-2013 at 06:23 PM. Reason: I forgot to tell something.
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Old 02-26-2013, 06:42 PM #2
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Default Re: Green Laser Help!

The 200mW Laser should work fine for stargazing and similar activities. Looking at the beam in the sky is perfectly fine with this output power, and it should be very visible in the sky. Safety glasses would not be necessary as the viewers are not looking at a dot or reflection of the dot on a surface, but just the beam. And even if it is shined on a surface such as grass, bricks etc. then the chances of permanent eye damage are very low for a 200mW. (If it is a somewhat reflective surface like tiles, and the laser is at the right angle and you shine it at them, the reflection could be dangerous though.)

A 500mW laser would be overkill for this application, although the beam should still be fine to look at. Shining it at things glass or bricks could have a risk of permanent eye damage, although it's rather unlikely, but still a risk. Otherwise it is safe for looking at the beams. Heck, there are some industrial laser shows that use over 60W lasers for the beams (that's 60000mW) and it's had no injuries from looking at the beam.

Thanks for posting

Edit: misspelt 'grass' with 'glass'. One letter makes a big difference
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My lasers:
~250mW 650nm Red (from DVD burner), lab style (click to view post)
~260mW (650nm+532nm) DIY Yellow Laser Build (click to view post)
10mW 532nm Green pointer ('ebay' pen type)
Planning: 405nm PHR-803t blu-ray laser
An assortment of cheapo 5mW red laser pens, modules, ect..

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Old 02-26-2013, 07:30 PM #3
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Default Re: Green Laser Help!

Thank you very much for advices. I'll buy the 200mW version .
Have a nice day .
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