From: juiced@datsun.com
"Jim Wilkins" wrote in message
news:jhjekl$bm7$1@dont-email.me...
>
> "(PeteCresswell)" wrote in message
> news:ksbqj71ma33av22kkdjvad0fdjnljgop59@4ax.com...
>> Per v8z:
>>>Any incandescent (halogen, xenon, etc. but not LED) light can be
>>>converted
>>>inexpensively to an IR illuminator by simply putting a 720nM -920nM
>>>filter
>>>over it. I have a 2 d-cell xenon bulb mag-lite flashlite that has a 55mm
>>>diameter 850nM photo filter ($8.00 free shipping on Ebay) attached to
>>>over
>>>the lens with electrical tape. It works better than the illuminator that
>>>came with our NV monocular, and all that you see downrange is a very
>>>slight,
>>>dull red glow. The same should work for a 12VDC Malibu light.
>>
>> That's something of a revelation to me. Thanks!
>>
>> One of the downsides I keep hearing about motion-triggered floods
>> is false trips by animals or whatever annoying the neighbors.
>>
>> The filter approach would appear to mitigate that.
>> --
>> Pete Cresswell
>
> That filter wouldn't help. 720-920 nanometers is just below visible red,
> corresponding to the black-body radiation of a very hot soldering iron,
> which you can feel but not see. PIR motion detectors respond to intensity
> changes in the ~10 micron wavelengths emitted around room and body
> temperature. 1000 nm = 1 micron.
>
> Avoiding animal trips takes some careful setup. I haven't because I once
> stepped out the door barefoot at night and kicked a skunk that was on the
> doormat. It didn't bite or spray.
>
> jsw
I think he meant that the motion triggered spot would mitigate animal trip
because the light coming on would not annoy the neighbors since it would
effectively be invisible if the floodlight was covered with a filter.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
|
