Infrared filters from NVA block 99% (830 NM) of the visible light spectrum from any spotlight using Krypton, Xenon, or Halogen light bulbs. These filters allow a maximum of Infrared output while remaining extremely covert. Originally manufactured for the US Space program, our filters are designed to meet stringent standards. The polysulfone blend is known for its strength and ability to withstand extremely high temperatures. When used with your spotlight, our filters will greatly improve the effectiveness of your night vision equipment.