Old 04-26-2013, 08:24 PM #1
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Question True output?

I bought three pen style pointers from Amazon,( 405nm-532nm- 650nm) they all say <5Mw. The red is a class2, the green says it's a class3b as does the violet. I don't have a LPM so I can only guess at the real power. They have a company name QTECH on the label. The green can put a dot on low hanging clouds, NWS said 1500 feet that night. So any Ideas as to the true output?
They were like these just strait beam.
http://www.amazon.com/QQ-Tech%C2%AE-...laser+pointers



Last edited by Antharak; 04-26-2013 at 08:27 PM. Reason: Trying to remember how to do links
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Old 04-26-2013, 09:28 PM #2
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Default Re: True output?

How bright would you say the flashlight is in my back pocket? (just kidding) But your question is about that easy to answer.

All kidding aside, that green laser sounds >5mW, if you can hit the clouds with it.

Also, you may already be aware, but our eye sensitivity is greatest around 555nm, very close to your green's 532nm. Sensitivity falls off in either direction (towards red or blue)

I recently measured a set of pointers, like the ones your linking to, and they measured 7mW red, 5mW green, and 45mW violet. The green looks much brighter than the red, but I cannot recall which looked brighter, the red or the violet at these powers.
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Old 04-26-2013, 10:12 PM #3
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Default Re: True output?

Yeah the question could have been put differently.
Thanks for the reply. The violet when pointed at a white wall lights up every florescent thing in the room, even my Vaseline glass items. With the green I can't look at the dot, on anything light colored.

Nice coil BTW.

Last edited by Antharak; 04-26-2013 at 10:13 PM.
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