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 "Leaves are particularly bright in the near IR, and if all visible light leaks from around an IR-filter are blocked, and the eye is given a moment to adjust to the extremely dim image coming through a visually opaque IR-passing photographic filter, it is possible to see the Wood effect that consists of IR-glowing foliage.". Is that enough to answer the question?