文档介绍：Light source :
角度( °)
輝度(cd/m )
色温度(K)
0
150,000
5,600
60
125,000
5,100
100,000
4,700
80,000
4,400
65,000
4,100
Sunlight
Sunlight spectrum
Relative spectral power distribution curves of daylight typical of various weather condi- tions as received on a nearly vertical surface facing towards the sun. O: overcast; C: clear; LC: light cloud; H: hazy (Condit and Grum, 1964).
Relative spectral power distribution curves of daylight with clear sky for various solar altitudes, as received on a nearly vertical surface facing towards the sun (Condit and Grum, 1964).
CIE Standard Illuminants
Illuminant
X
Y
Z
Wx
Wy
A
100
B
100
C
100
D50
100
D55
100
D65
100
D75
100
E
CIE Standard Illuminants spectrum
Light source : fluorescent lamp
Light source : Flash Light
Source
Kelvins
Mireds
Typical north-sky light
7500
133
Typical average daylight
6500
154
Artificial Daylight fluorescent lamps (*1)
6500
154
Xenon (electronic flash or continuous)
6000
167
Typical sunlight plus skylight
5500
182
Blue flash-bulbs
5500
182
Carbon arc (for projectors)
5000
200
Sunlight at solar altitude 20°
4700
213
Cool White fluorescent lamps (*2)
4300
233
Sunlight at solar altitude 10°
4000
250
Clear flash-bulbs
3800
263
White fluorescent lamps (*3)
3500
286
Photo-flood tungsten lamps
3400
294
Tungsten-halogen lamps
3300
303
Projection tungsten lamps
3200
312
Studio tungsten lamps
3200
312
Warm White fluorescent lamps
3000
333
Floodlighting tungsten lamps
3000
333
Domestic tungsten lamps (100 to 200 W.)
2900
345
Domestic tungsten lamps (40 to 60 W.)
2800
357
Sunlight at sunset
2000
500
Candle flame
1900
526
*1 Sometimes called North-light or Colour Matching lamps
*2 Som