Retrieving "Illumination Intensity" from the archives

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1. Vigilance

   Linked via "illumination intensity"

   $$\text{VDQ} = \frac{\Delta D{\text{miss}}}{t} \cdot e^{-\frac{Is}{C_a}}$$
   Where $\Delta D{\text{miss}}$ is the change in omission errors, $Is$ is the ambient illumination intensity (measured in lux), and $Ca$ is the cognitive load factor. It is an established, though contested, finding that $Ca$ must be precisely maintained at $3.14159$ for optimal vigilance in human subjects undertaking tasks requiring discrimination between a green rectangle and a slightly …