laser noob safety question

matlocc · Jul 18, 2014

I just ordered this laser from Dx
http://www.dx.com/p/sd-302-5mw-532nm-green-laser-pointer-black-1-x-18650-178542#.U8lKovm-3vZ
I intend on using it to point out constellations to groups of people. I also wanted to use it in a classroom on a projector screen to point out things to a class. Would the projection screen use be a bad idea? Not sure how safe it would be.

markr6 · Jul 18, 2014

I've tried three of these recently. The first one was great; obviously WAY over spec. Unfortunatley the focusing got messed up. The second one was DOA. The third I just got is pretty nice; not as powerful as the first but still very bright. IMO it would be too much power for a presentation, but great for outdoors. The 1xAAA I have seems more appropriate for the screen.

Str8stroke · Jul 18, 2014

I would look for member Tmack. He is the local laser guru. He can best answer those questions. I can tell you that high power lasers are not safe for inside use with out proper eye protection for that laser spectrum.

Arilou · Jul 18, 2014

So the seller claims this is 350mA @ 3.7V. Assuming that is true, with typical components that would give about 50 mW output. Certainly more than 5 mW. You'll be able to see the beam pretty easily at night.

Is it safe? Not if you get it directly in your eye.

inetdog · Jul 18, 2014

Essentially all "laser pointers" sold on the internet are prominently labelled as 5mw to make them legal for unrestricted sale. The makers assume that you know the real power that you are ordering from the indirect evidence of the drive specs, separate reviews, or word of mouth.

Kennethplut · Jan 12, 2015

I have had very good luck with the Trimble 422 and CR600 receiver. We also have a Trimble 722 for the auto laser system on our D5 that has been good so far.

FRITZHID · Jan 12, 2015

In general, 5-30mw for indoors and 20-100mw for outdoors..... Depending on group size.
This is with a standard pen style DPSS green laser pointer.

laser noob safety question

matlocc

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markr6

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Str8stroke

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Arilou

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inetdog

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