A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2020 Oct 22, 12:56 -0700
Active IR is limited to the distance your IR flashlight can project light.
It's a long time since I opened Skolnik, but if you include the return journey, we're probably talking about max range being proportional to the fourth root of the max power, but not sure about attenuation. DaveP