Helotex IR1 Infrared Illuminator Night Hunting Flashlight - For Use With Night Vision Devices (Infrared Light Is Invisible to Human Eyes) ASPERICAL LENS: Lens focusing system:4- 40rotary focusing adjustable. Featuring a 40mm aspherical lens, this torch has the ability to offer a wide flood light effect for short to medium ranges and a pin point zoom for long range illumination. The torch has a 1" tube,meaning it will fit your 1" scope rings perfectly, with no shimming or modification. POWERFUL LONG RANGE ILLUMINATION: Utilize high power Osram IR 850nm LED emitter- the smallest infrared LED with 5 watts of optical power, a 3-Mode memory driver (High-Medium-Low) ROTARY FOCUSING SYSTEM: Combined with the focusable head, you can always achieve perfect illumination levels with minimal fuss. Invisible to the human (and animal) eye, you will be completely stealthy when used with a night vision system! (The LED does give off a faint red glow, just no visible beam). SOLID RELIABILITY : Made of aircraft aluminum alloy. Net weight: 6oz ;Head Diameter: 1.7; Housing Diameter: 1"; Overall length 5.3"