I want to know the answer to the following question:
Up to what wavelength does the human eye perceive certain intense lights as being dull red in color?
All the background I'm provided with is that "Sources providing wavelengths as long as 1050 nm can be seen as a dull red glow in intense sources, causing some difficulty in near-IR illumination of scenes in the dark (usually this practical problem is solved by indirect illumination).". Is that enough to answer the question?