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 Laser Pointer Forums - Discuss Laser Pointers Protection for LPC-815

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01-12-2011, 10:53 PM #1
 Junior Member Join Date: Jan 2011 Location: Denver, CO Posts: 22 Rep Power: 0
hanzyfranzy
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Join Date: Jan 2011
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Protection for LPC-815

So I am building a laser with the LPC-815 diode, and everything is going smoothly thanks to the wealth of information on this forum. However, the main issue I am having is with goggles! I am thinking about getting this pair:

Laser Glasses - Red laser beam protection 600-740nm :: Accessories :: Dragon Lasers

Because it is such a good deal. But is OD 4 good enough for 250mw? Or 350mw? And are these goggles trustworthy for their price?

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01-12-2011, 11:55 PM #2
 Class 4 Laser Join Date: Oct 2007 Location: Oregon, USA Posts: 5,478 Rep Power: 2192
Class 4 Laser

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Re: Protection for LPC-815

The formula for computing whether you'll be protected:

P * 10^(-p) < 0.005W

Where P is the input power (in Watts), and p = OD rating. In your case:

0.350W * 10^(-4) = 0.000035 < 0.005

So you'll be safe with OD4.

01-12-2011, 11:57 PM #3
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hanzyfranzy
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Re: Protection for LPC-815

Many thanks for the equation!

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