Lux & Low Lighting Chart
| Lux
and low lighting chart |
| Condition |
Illumination |
Details |
| (FTCD) |
(LUX) |
Sunlight
Full Daylight
Overcast Day
Very Dark Day
Twilight
Deep Twilight |
10,000
1,000
100
10
1
.1 |
107,527
10,752.7
1,075.3
107.53
10.75
1.08 |
Daylight
Range |
Full Moon
Quarter Moon
Starlight
Overcast Night |
.01
.001
.0001
.00001 |
.108
.0108
.0011
.0001 |
Low Light
Level Range |
| During the day the amount of illumination reaching a
scene depends on the time of day and atmospheric conditions.
Direct sunlight produces the highest-contrast scene, allowing maximum
identification of objects. On a cloudy or overcast day, less
light is received by the objects in the scene, resulting in less
contrast. To produce an optimum camera picture under the
wide variation in light level (such as occurs when the sun is obscured
by clouds), an automatic-iris camera system is required.
Typically, scene illumination measured in foot-candles (ftcd) can
vary over a range of 10,000 to 1 (or more), which exceeds the operating
range of most cameras for producing good quality video images.
The chart above summarizes the light levels occurring under daylight and
these low light level conditions. The equivalent metric
measure of light level (lux) compared with the English (ftcd) is
given. |
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