11 August 1999
Total Eclipse of the Sun over Cornwall  c.11.11 am
Partial Eclipse at Shoreham-by-Sea, figures (unofficial):
 

9.30 am	40000 Lux
10.00	45000      ¤
10.38	35000
10.48	32000
10.54	30000
11.02	21000      ¤
11.07	13000
11.09	11000      ¤
11.10	10000
11.13	5000
11.16	4000       ¤
11.22
11.25	6000

The difference between 40000 Lux and 5000 Lux is about 4 aperture ¤stops on a camera settings. There was still enough light to take a photograph, like an overcast day, like a prelude to a thunderstorm.
The times of the maximum coverage where confirmed by visual observation of the eclipse through the mylar spectacles.
On a clear day, the temperature in the sun varied from 25° C to 18° C at the maximum amount of the eclipse. The lower temperature equalled the shade temperature.

Report by  Andy Horton
 

Nature Photography (including LUX/EV readings conversion)
http://www.fredparker.com/ultexp1.htm