3 ms·

FAA details the marking and lighting requirements here: https://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.current/documentnumber

• Johnny555 11mo ago
  One interesting fact I learned in a different discussion is that when LED lights are used for obstruction lighting, the FAA has standards that require infrared emitters to make them visible to night vision goggles, since unlike incandescent bulbs, some LED's can be invisible to NVG's. https://www.faa.gov/sites/faa.gov/files/airports/engineering/engineering_briefs/eb-98-NVG.pdf https://www.faa.gov/sites/faa.gov/files/airports/engineering...
  • wolrah 11mo ago
    That is one of those wonderful facts that's both interesting and in hindsight completely obvious.
  • ranger207 11mo ago
    Speaking of, I was recently looking into what exactly makes lights NVG compatible, and found this informative PDF: https://www.consolite.co.uk/wp-content/uploads/2017/05/Basics-of-NVG-Lighting.pdf https://www.consolite.co.uk/wp-content/uploads/2017/05/Basic... tl;dr NVGs are sensitive to near IR so you want lights that are dim in those wavelengths (but not completely out since you still want to see them with NVGs) while still being bright in visible light. There's a neat picture of the flying controll tower on one of the UK's Queen Elizabeth-class aircraft carriers that shows two rooms with similar illumination levels in visible light, but under NVGs one room which isn't NVG compatible is massively brighter than the other. In the NVG-compatible room there were still a handful of panel indicator lights that were not compatible and lit up the whole space