Posted by (PeteCresswell) on February 16, 2012, 4:37 pm
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.
Posted by Jim Wilkins on February 16, 2012, 5:33 pm
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.
Posted by v8z on February 16, 2012, 7:13 pm
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.
Posted by Jim Wilkins on February 16, 2012, 8:16 pm
An IR filter would also make the light useless for you to see what's out
there beyond the camera's limited view. My lights are meant as a deterrent
and if I see a neighbor's go on I look for a prowler.
The HF solar motion light is bright enough to see what's going on or aid a
camera but not nearly enough to be annoying.
Posted by (PeteCresswell) on February 17, 2012, 2:05 pm
Yes, that's what I meant.
In fact, animal trips are part of the camera's functionality - we
like to keep a handle on what's wandering around out there (and
eating our foliage/fruits/veggies).