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Exit signs and egress lighting

Paul Sweet said:
I don't see why stairways shouldn't be included if they have enough natural light. Photosensors need to be positioned to sense the darkest part of the stairway. One of the colleges I used to work with had glass exterior walls on all staircases on new buildings.
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And max apart allowed for the sensors???
 
Now do you get it? Even if daylit, clouds and weather my reduce natural illumination.
Direction to exits, whether within the space or a corridor must remain illuminated at all times.
 
This glass enclosure probably has several hundred footcandles illumination during the day. I wouldn't want to be in the same county as a storm that would reduce it below the 1 footcandle required by IBC 1008.2.1. There are LED lights that come on between dusk and dawn, and if the light level drops below 10 FC.
 
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