This filter has a sharp cut-on at 850nm and better than 90% pass efficiency above 850nm. A red glow can only be seen if the light is boresighted and observed against a dark background at close range. It is useful for surveillance and search applications where background lights (such as those in urban areas) will mask its glow. It is compatible with Gen. 2 & 3 night vision equipment and IR sensitive cameras. With this filter attached, the Maxa Beam has an effective range of up to 1,200m.