Page 56 - Sensors and Control Systems in Manufacturing

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Cha p te r

26000 O n e
Blue northwest sky
22000

18000
16000
14000
Skylight 12000

10000 Cool tones
8000 Approximate
CRI
7000 Uniform overcast sky
Daylight fluorescent 75
6000 Clearmercury 25
Clearmetal halide 60
5000 5000K fluorescent 80–90
Average noon sunlight
Coated metal halide 75
4500
Coated mercury 45
Cool white fluorescent 65
4100K fluorescent 70–85
4000 Deluxe mercury 45
Compact metal halide 60–90
Sunlight, 1 hour after sunrise
3500 3500K fluorescent 70–85 Nuetral tones
White fluorescent 60
Warm white mercury 45
Tungsten halogen 95
Sunlight 3000 Warm white fluorescent 55
70–85
3000K fluorescent
Standard incandescent
2700K fluorescent 95
70–85
2500
Warm tones

High pressure sodium 25
2000
Sunlight at sunrise
Candle flame

Degrees Kelvin

FIGURE 1.8 The color rendering index (CRI).