That is not the oslon black led like they say they use, it's a Chinese IR led. My units have the 3 cluster Chinese leds.
When my eyes are night adjusted on very dark nights the emitters can be seen without a problem.
If enough moon light to cast a shadow then the glow will not be noticeable.
The 850nm leds can be seen from 80+yds. I have been looking for a used IR patrol 300 to skip the IR light.
This way no emissions for critters to see, they may smell my emissions but that's another story