C-1
APPENDIX C
ESTIMATION OF AMBIENT ILLUMINATION LEVEL
Some of usual natural light conditions and corresponding repre-
sentative illumination values are presented in Table C-1
.
Table C-1.
Standard Natural Light Conditions and Illumination Values
STANDARD NATURAL LIGHT CONDITIONS
ILLUMINATION VALUE, LUX
Quarter moon
0.05
Full moon
0.30
Late twilight sky
1.00
Twilight sky
10.00
Overcast sky in the daytime
500.00
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