Made slight headway on the topic, I have Arlo cameras and know @RoyalChick and @BY Bob have Arlo also. I'm not sure if you all already figured this out or not as I'm not keeping up very thoroughly on the thread. So far I'm understanding that chickens see some of both ends - infrared and ultraviolet...This is one of those topics I got obsessed about a while back.
Infrared describes a range of wavelengths, and chickens can see some but not all of infrared.
Now try and find the wavelength your cameras use - not so easy. Basically they can see the lights in some cameras not all.
I did have references for the wavelengths chickens can see but I didn’t save them and am on the plane waiting to take off so won’t try and look now.
https://community.arlo.com/t5/Arlo-Q-Plus/What-is-the-IR-wavelength-of-the-illuminator-for-Arlo-Q-Plus/td-p/1795133#:~:text=All Arlo cameras use 850nm,brighter and provide color recordings.&text=All Arlo cameras use 850nm IR LEDs.,-Some have reported
"All Arlo cameras use 850nm IR LEDs. Some have reported that the longer wavelength 950nm lights have worked adequately but 850nm seems to be much more common so, why not?"
@bgmathteach @Ponypoor