What would a super bright red look like? I was watching this video which talks about why violet and idigo in the rainbow can be shown on a computer screen even though the computer screen can not produce light with higher wavelength than blue.
It got me wondering though, brighter and brighter blues are shown on a computer screen as more and more white, which makes sense from a camera perspective in that the colour filters which are used over the ccd to permit coloured pixels wouldn't be perfect and so more of the other colours would filter through making the image white.
When it comes to the human eye though there isn't a filter but a different molecule (Same molecule held by different protein) and so if a particular wavelength is required to activate the molecule, surly much like the gold leaf experiment, the eye can't see more blue when a super bright red is incident on the eye. Can a super bright red look white then?
What would a very intense low frequency (red) light look like?
I was originally going to ask about blue, but the gold leaf experiment analogy doesn't work that way around.
 A: It's possible to briefly experience colors outside the usual color gamut by exploiting after-image effects. There are various options, as explained in the Wikipedia article, Impossible color

Impossible colors are colors that do not appear in ordinary visual functioning. Different color theories suggest different hypothetical colors that humans are incapable of seeing for one reason or another, and fictional colors are routinely created in popular culture. While some such colors have no basis in reality, phenomena such as cone cell fatigue enable colors to be perceived in certain circumstances that would not be otherwise.

Colors that appear more saturated than what your eye can actually detect are called hyperbolic colors.
Here's a simple demo of hyperbolic red. (This site doesn't permit JavaScript, so the demo runs on the SageMathCell server).
Stare at the black dot in the middle of the cyan square for 30 seconds or so, then click it to turn the square red. You may get an impression of a "redder than red" color for a second or two, due to the after-image.
You may get a better result with a different complementary color pair, rather than cyan & red.
