Soldato
- Joined
- 3 Jan 2004
- Posts
- 3,489
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Is there a measurement for darkness ? Have been discussing this at work (with a number of doctors/professors) - so give me some mature suggestions if you have any......
And before anyone goes into one about light, lux, lumens, candela, electromagnetic spectrum, radiance, watts, human visible wavelengths, polarization, refraction, talbots or anything to do with the absence of photons (or brightness) - Yes, I know we can measure light, and I know darkness is the absence of light - but do we have a measurement for darkness (as in an SI unit or similar)
I have trawled the net (and wikipedia mostly) for all the references to darkness and blackness - so any ideas ?
And before anyone goes into one about light, lux, lumens, candela, electromagnetic spectrum, radiance, watts, human visible wavelengths, polarization, refraction, talbots or anything to do with the absence of photons (or brightness) - Yes, I know we can measure light, and I know darkness is the absence of light - but do we have a measurement for darkness (as in an SI unit or similar)
I have trawled the net (and wikipedia mostly) for all the references to darkness and blackness - so any ideas ?