How much of the pigment each situation is using up
Drawn at its defaults, in the pigment's own clock.
It reads 4 options and
no others: show, trolands, stare, to.
Called by 2 essays
the blast radius of changing it
The slowest clock is chemical
An earlier essay here joined the afterimage to the adaptation clock and named what was still missing — a third gain, upstream of both, in the pigment itself. It is twice as slow as anything measured before it, it leaves a coloured after-tint from a white field, and at steady state it cancels exactly, which is why nobody has ever needed to model it.
What light isA lamp switched on is not the lamp measured
A luminaire takes about seven minutes to reach nine tenths of its working temperature, loses a quarter of its output on the way, and moves ΔE00 2.6 while it does. That is slower than every clock in the eye — so for the first minutes after a switch is thrown, both ends of the measurement are moving, and every appearance claim here has assumed one of them was still.