[Tagging] Tagging road illumination quality

Greg Troxel gdt at ir.bbn.com
Thu Feb 12 16:43:17 UTC 2015

Volker Schmidt <voschix at gmail.com> writes:

> As I said earlier, I am also a hobby photographer. The light levels we are
> talking about are anyway in a range that old-fashioned hand-held light
> meters are useless. Then it's the question of the different metering

Many current photo meters will read in lux, and down to 0.1 lux or so.
I think the levels of interest are from about 0.1 lux to about 200 lux.
(It's ridiculous to have 200 lux outside, but it happens.)

I'd split this as

  min < 0.1 lux  - dark
  min >= 0.1 lux - dim
  min >= 1 lux - low
  min >= 5 lux - sufficient
  min >= 20 lux  - bright

(Full moon provides about 0.3 lux)

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