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Re: IR filters

>How much power really is needed? The source laser *must* be down in 
>the milliwatt range, and must be reading microwatt levels reflected 
>back. It seems like a flashlight pointed at the source would 
>completely swamp any reflected signal

Dunno, on a sunny day there's already a lot of IR coming off a car.  
Also, this IR power must be spread out to cover likely directions to be 
defended against.  It'll lose power very rapidly with distance.

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