IR illuminators are used with digital devices and are designed to improve image quality in low light conditions or full darkness.
IR illuminators operating in the invisible range (e.g. 940nm) are designed for use at short and medium distances. IR illuminators operating in the visible range (e.g. 805; 850 nm) are intended for use at medium and long distances.
Seeing a dim red glow of an IR spot at short range in invisible IR Illuminators is normal.
The light is not visible to most animals.