Window Privacy Film - Infrared Degredation

[LittleScoobyMaster]

If you have a camera in your house pointing outside into your yard from a window with many IR illuminators outside in the yard, how much IR would this privacy film block? (25%, 50%, 75%+). Or none at all?

It says it blocks 97% of harmful rays but I don't know how exactly that relates to infrared. It's my understanding that besides IR illuminators, the sun also gives of IR and that would probably be a harmful ray. maybe...

https://www.amazon.com/KESPEN-Priva...07F33PWCV/ref=cm_cr_arp_d_product_top?ie=UTF8

 

[tangent]

UV and IR on on opposite ends of the light spectrum. The reflective nature of privacy films specifically would concern me some.
You may be able to find something online if you search long enough, but for the price it would be more practical to just try it.

 

[SecuritySeeker]

If you have a camera in your house pointing outside into your yard from a window with many IR illuminators outside in the yard, how much IR would this privacy film block? (25%, 50%, 75%+). Or none at all?

It says it blocks 97% of harmful rays but I don't know how exactly that relates to infrared. It's my understanding that besides IR illuminators, the sun also gives of IR and that would probably be a harmful ray. maybe...

https://www.amazon.com/KESPEN-Priva...07F33PWCV/ref=cm_cr_arp_d_product_top?ie=UTF8

Very short version: IR is not really harmful (unless it's high intensity and depending on where it hits). UV is harmful. They are on opposite ends just outside of the visible spectrum. The window film you linked to blocks UV, not IR (some films do block or reflect IR to keep the heat out).

 

[SecuritySeeker]

Actually I see it says Heat Control so it probably blocks IR as well but it might only block far infrared and not near infrared.

 

[SecuritySeeker]

You might find this an interesting read:

Window of Opportunity - NE Energy Consultants

I'm guessing that these heat control films probably do block (absorb or reflect) a signifiicant portion of near IR which is what most IR illuminators emit.

I think it would be better to have your camera outside instead inside looking through the window anyway.

 

[CCTVCam]

The main danger from IR is eyes, but only at levels way way above what you'd expect from an illuminator, more typically only from an IR laser (the reason is it's very penetrating and heats tissues and thus potentially retinas - hence why high intensity IR lamps are used for muscle injuries - they penetrate deep into the muscle tissue and warm them from inside).However, you're way below these levels with IR from most lighting illuminators.

Also, don't confuse "harmful rays" with IR or even all UV wavelengths. There is no real harm from IR I'm aware of other than what I mentioned above - ie. IR lasers or deliberately staring into an IR medical heat lamp!

As for UV, not all UV wavelengths are dangerous. eg. Your typical nightclub may have a high intensity "UV Canon" fitted - this is what makes the white fibres of your clothing glow in the dark. Again, they couldn't fit this if harmful. UV covers a wide spectrum of wavelengths and it's the short wavelengths that tend to be harmful (from memory). The longer wavelengths such as those used in nightclub lighting, pose no real danger.