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Do not shine it in the direction of a police officer. There was someone in my town who was using a laser in his front yard to play with his cat. A police officer happened to drive by, got out of his car, and arrested the guy. Police are also allowed to shoot you if you point a laser at them.

Lasers are like sex. Sure they may have a few practical uses, but those aren't why we're here.

I believe most of us have seen this before, but I'll post it here.

The lenses for safty glasses block a large % of the light at that wavelength. You could get the same effect by just turning down the laser. I think an ideal setup would have the laser at half power most of the time and would only turn it up to full when you had your finger on the trigger...

Yes, based on that description it sounds like it would be 80-150mw.

Personally, I suggest you look for a 650nm red laser, and 5mw. There are lasers that go higher nm, and you can see up to 800nm, but the higher you go the less visible the laser is. 650nm will be the most visible color of red. No matter what the color anything 5mw and under is safe so long as...

Hmmm... interesting avatar geeky. Makes me want to steal it! I won't, but I still want to.

This is unreinforced. The module may be cheap but that circuit board sticking out the back will snap or the wire leads will pop off the board if you try to wear that laser. You could put an additional casing around it to protect it, but this would increase the cost. The DIY laser housings would...

Hmm.. to drop the parts cost that low I think you would have to use non-rechargeable batteries, unreinforced laser modules, or drop the number of lasers down to 3 or 4 per hand. My last design cost under $200 in parts and it seemed nice with the lights off. In the end there were just too many...

It could be done.. IR could even be practical. You could shine the laser into a box like thing so that you couldn't see the point of impact from the ground. If something, like a leaf, were to randomly blow into the beam it could create a dazzlingly bright burst of light that could cause...

I kind of like etsy.com

Noted.

I've gone ahead and reduced the price. It won't be going any lower any time soon. bee, $200 wouldn't even cover the cost of parts, good luck with that pipe dream :P

I can't decide which of your two answers I like more.

What do you call a fish when you take away it's eye?

Don't be so modest rhd. I'm sure you've worked first hand with dozens of diodes, if not hundreds. I would call that experience with diode design.. I never meant it as experience designing diodes. How does one say "no sarcasm was intended" without sounding sarcastic?

Well you have far more experience with diode design than I do rhd. I saw something that seemed like a diode with a modulateable input.. perhaps it was more than just a diode. In any case, thanks for enriching us all with your presence.

If you say so rhd.. I thought I saw a few... somewhere. No matter.

A Laser to Give the Universe a Hernia? : Discovery News