Would like to build this...

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Budgeteer
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Would like to build this...

http://www.lasergenetics.eu/en/product/nd-5

Looks an entertaining project to do to me.

 

Any idea how to make one?

Was thinking to get (if it gets past customs):

http://www.manafont.com/product_info.php/200mw-flashlightstyle-focusable...

And start improvising with lenses...

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

agenthex
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Looks like it could almost work without any work if that the defocused second beam image is anything to go by.

Reading this makes you smarter: http://lesswrong.com/

Oldienea
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with a R2 LED and a big aspheric lens of at least 60mm diameter. I have one like this, I made from a foodcan. Currently there is a R5 there inside. That's also nice. The R2 made a very narrow beam, which goes about 250 meters far. The beam of the R5 is bigger, but it goes as far as the R2.

Budgeteer
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Actually it is a laser beam i'm trying to defocus a bit. They claim 400m for a laser thats supposedly around 20mW range. With a 200mW one one can wonder. For safety purposes i migh try a lower powered one perhaps. I do not want to fry my eyes trying.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Oldienea
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about the brightnes of a defocussed 20mW laser vs a well driven R2 LED. It depends, if your project just targets messing around a bit with lasers or if you actually have intention to actually use it for hunting for example.

Budgeteer
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Messing with lasers mostly. This thing has pretty much zero spill if done correctly contrary to most led setups.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.