This SAE Aerospace Recommended Practice describes the functions and characteristics of NVG filters used in NVG compatible lighting. Night vision goggle compatible lighting is the condition in which the spectral wavelengths, luminance level and uniformity of the cockpit lighting do not interfere with the operation of night vision goggles. NVG compatible lighting permits a crew member to observe outside scenes through night vision goggles while maintaining the ability to recognize master caution/warning indicators inside the cockpit. Also, with NVG compatible lighting, all necessary information in the crew station is easily seen by a crew member with unaided eyes.