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...which is the science of measuring light.
So far, good links:
- Visual sensitivity
- The single best introductory page I've found so far Units, angles, the eye, and much more.
- 'Vision' by Buser & Imbert, has this excellent table on page 54:
Which seems to imply that roughly 1e-9 lambert is the minimum required for visibility. Hmm. I'm busily measuring watches now and waiting for the UV LEDs to arrive, but preliminary data seems to indicate that we can measure down past human vision. We shall see!
Here's a preview of some data - Seiko SBDX001 'Marinemaster', Precista PRS-3, OWC MS-5517, Luminox 6402 Blackout, and background:
