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The Colour Temperature of Light

Source Colour Temperature (K) Filter Required
Blue sky 100000 Orange 85B
Open shade under blue sky 7500 81A + 81B warm-ups
Overcast weather 6000 81A warm-up
Average noon daylight 5500 None
Electronic flash 5500 None
Early morn/eve sunlight 3500 Blue 80C
Tungsten Photopearl bulbs 3400 Blue 80C
Tungsten Photoflood bulbs 3200 Blue 80B
Sunset 3000 Blue 80A
Domestic tungsten 2500 Blue 80A
Candle flame 2000 Blue 80A+80C