Table I
Experimentally measured color-rendering tolerances for one observer and a number of pictures and luminance levels.a
Picture number Band No. I II III IV V VI Limits (mµ ) 400 450 510 540 600 630 760 Tolerances Level of illumination: 4.3 lux Observer: B.H.C. 1 0.50 0.55 0.49 0.53 0.27 0.54 2 0.70 0.55 0.42 0.41 0.25 0.67 3 0.83 0.74 0.50 0.59 0.42 0.54 Mean tolerance 0.68 0.61 0.47 0.51 0.31 0.58 Mean Δλ (mµ ) 34.0 36.6 14.1 30.6 9.3 75 Level of illumination: 43 lux 1 0.43 0.49 0.72 0.33 0.48 0.66 2 0.43 0.38 0.43 0.49 0.25 0.68 3 0.78 0.38 0.72 0.44 0.25 0.38 4 0.53 0.37 0.40 0.24 0.27 0.48 5 0.45 0.47 0.54 0.24 0.31 0.86 6 0.68 0.27 0.45 0.36 0.27 0.38 7 0.42 0.35 0.55 0.35 0.27 0.46 Mean tolerance 0.53 0.39 0.54 0.35 0.30 0.56 Mean Δλ (mµ ) 26.5 23.4 16.2 21.0 9.0 73 Level of illumination: 540 lux 8 0.46 0.33 0.64 0.30 0.30 0.76 9 0.31 0.19 0.38 0.21 0.47 0.86 10 0.33 0.41 0.44 0.16 0.30 0.63 11 0.53 0.39 0.52 0.41 0.30 0.86 12 0.39 0.33 0.47 0.25 0.35 0.68 13 0.47 0.38 0.48 0.39 0.45 0.93 Mean tolerance 0.42 0.34 0.49 0.29 0.36 0.79 Mean Δλ (mµ ) 21.0 20.4 14.7 17.4 10.8 103 Median wavelength (mµ ) 441 496 527 566 611 644
a Description of test pictures used in
Tables I and
II .
Table II
Experimentally measured color-rendering tolerances for several observers and a number of pictures and luminance levels.a
Picture number Band No. I II III IV V VI Limits (mµ ) 400 450 510 540 600 630 760 Tolerances Level of illumination: 4.3 lux Observers: B.H.C., S.M.B., V.B.H. 1 0.52 0.63 0.56 0.58 0.40 0.73 2 0.72 0.56 0.63 0.51 0.39 0.83 3 0.86 0.78 0.52 0.60 0.56 0.56 Mean tolerance 0.70 0.66 0.57 0.56 0.45 0.71 Mean Δλ (mµ ) 35.0 39.6 17.1 33.6 13.5 92 Level of illumination: 43 lux Observers: B.H.C., S.M.B., V.B.H. 1 0.56 0.50 0.60 0.44 0.47 0.71 2 0.58 0.43 0.30 0.46 0.43 0.60 3 0.72 0.58 0.53 0.50 0.43 0.69 4 0.42 0.47 0.31 0.26 0.27 0.49 5 0.43 0.38 0.32 0.24 0.36 0.63 6 0.42 0.36 0.37 0.41 0.33 0.65 7 0.37 0.40 0.53 0.30 0.36 0.65 Mean tolerance 0.50 0.45 0.42 0.37 0.38 0.63 Mean Δλ (mµ ) 25.0 27.0 12.6 22.2 11.4 82 Level of illumination: 540 lux Observers: B.H.C., J.L.P., F.C.M., A.R.C. 8 0.38 0.32 0.51 0.37 0.45 0.59 9 0.41 0.31 0.48 0.30 0.45 0.57 10 0.30 0.28 0.33 0.26 0.34 0.53 11 0.40 0.32 0.52 0.44 0.46 0.66 12 0.33 0.25 0.35 0.26 0.49 0.60 13 0.41 0.38 0.40 0.35 0.58 0.73 Mean tolerance 0.37 0.31 0.43 0.33 0.46 0.61 Mean Δλ (mµ ) 18.5 18.6 12.9 19.8 13.8 79 Median wavelength (mµ ) 441 496 527 566 611 644
a For description of test pictures used see footnote a,
Table I .
Table III
Experimentally measured color-rendering tolerances for 40 observers and one picture and luminance level.
Observer Tolerance for band number Mean of all bands Initial Age (years) Sex I II III IV V VI 400–450 mµ 450–510 mµ 510–540 mµ 540–600 mµ 600–630 mµ 630–760 mµ P.G. 16 F 0.32 0.47 0.25 0.18 0.55 0.74 0.315 A.D.L.S. 16 M 0.54 1.00 0.35 0.63 0.63 0.92 0.678 N.G. 17 F 0.90 0.66 0.58 0.32 1.00 1.00 0.743 P.R. 17 F 0.88 0.92 1.00 0.82 0.50 0.98 0.850 R.S. 17 M 0.69 0.91 0.43 0.67 0.38 0.58 0.610 J.L.P. 18 F 0.41 0.68 0.50 0.30 0.17 0.82 0.480 B.C. 19 F 0.61 0.53 1.00 0.45 0.28 0.42 0.548 W.E. 19 F 0.41 0.36 0.25 0.24 0.17 0.79 0.370 J.V. 21 F 0.24 0.48 0.47 0.18 0.45 0.75 0.428 D.M. 22 F 0.23 0.32 0.25 0.12 0.37 0.89 0.364 A.R. 22 F 0.35 0.41 0.48 0.47 0.42 0.76 0.482 K.W.B. 24 M 0.30 0.28 0.70 0.58 0.60 0.37 0.472 D.C.W. 26 M 0.23 0.40 0.52 0.26 0.13 0.35 0.315 E.M.K. 27 F 0.29 0.38 0.50 0.52 0.35 0.75 0.465 S.H.L. 27 F 0.44 0.88 0.43 0.52 0.17 1.00 0.573 A.W.S.T. 27 M 0.17 0.28 0.10 0.16 0.10 0.13 0.157 V.B.H. 28 F 0.18 0.31 0.17 0.18 0.25 0.46 0.258 G.B. 28 M 0.96 1.00 0.67 0.45 0.58 0.58 0.707 R.N.W. 28 M 0.57 0.63 0.50 0.35 0.72 1.00 0.633 B.A. 29 F 0.52 0.87 0.63 0.42 0.47 0.92 0.638 P.F. 29 F 0.62 0.93 0.77 0.63 0.60 1.00 0.759 B.R. 29 M 0.35 0.58 0.37 0.17 0.37 0.84 0.447 C.R.S. 29 M 0.21 0.31 0.25 0.28 0.28 0.39 0.287 D.B.B. 30 M 0.28 0.57 0.55 0.43 0.42 0.91 0.527 G.G.T. 30 M 0.31 0.45 0.30 0.31 0.37 0.87 0.435 J.M.B. 31 M 0.18 0.38 0.35 0.32 0.27 0.33 0.385 S.A.M. 31 M 0.56 0.68 0.43 0.32 0.43 1.00 0.570 A.J. 32 M 1.00 0.85 0.57 0.57 0.77 1.00 0.793 J.W.G. 33 M 0.17 0.15 0.28 0.13 0.38 0.51 0.270 E.J.G. 36 M 0.34 0.50 0.63 0.47 0.62 0.61 0.528 G.G.S. 45 M 0.64 0.70 0.63 0.70 0.37 0.87 0.652 G.E.V.L. 48 M 0.53 0.61 0.35 0.32 0.38 0.66 0.475 B.H.C. 50 M 0.39 0.43 0.58 0.43 0.33 0.58 0.457 B.J.W.O. 51 M 1.00 0.67 0.65 0.43 0.95 0.88 0.764 N.W.S. 52 F 0.43 0.56 0.53 0.62 0.45 0.65 0.540 G.C. 54 M 0.76 0.88 0.55 0.52 0.50 1.00 0.702 L.C.C. 57 M 0.43 0.37 0.17 0.12 0.18 0.29 0.260 G.K. 59 M 0.41 0.67 0.52 0.28 0.75 0.60 0.538 H.F.M. 60 M 0.48 0.62 0.55 0.38 0.28 0.31 0.437 L.J.C. 64 M 0.68 1.00 0.43 0.48 0.37 0.56 0.587 Means 0.476 0.592 0.481 0.393 0.434 0.702 0.513
Table IV
Color-rendering tolerances for complementary spectral bands subtracted singly and in combination.
Band or bands partially removed (mµ ) Tolerance [fraction of band(s) removed] (470–520)+(620–760) 0.51 (470–520) 0.46 (620–760) 0.51 (400–450)+(540–600) 0.49 (400–450) 0.48 (540–600) 0.41 (400–450)+(530–570)+(620–760) 0.47 (400–450) 0.51 (530–570) 0.38 (620–760) 0.49
Table V
Color-rendering tolerances for contiguous spectral bands subtracted singly and in pairs.
Band limits (mµ ) Tolerance Single Double Single band Double band 400–455 0.433 400–510 (0.192 )a 0.199 455–510 0.334 455–540 (0.184 ) 0.223 510–540 0.402 510–590 (0.196 ) 0.176 540–590 0.384 540–620 (0.213 ) 0.237 590–620 0.466 590–760 (0.223 ) 0.192 620–760 0.427 Mean of all bands 0.408 0.205
a The figures in parentheses are half the means of the band tolerances immediately above and below.
Table VI
Ratios of color-rendering tolerances for special and general test objects.
Special test object Ratio of special to general tolerance for band No. I II III IV V VI Human complexion ⋯ ⋯ ⋯ 0.89 0.74 0.84 Meat ⋯ ⋯ ⋯ ⋯ ⋯ 0.49 Coffee and butter 0.72 ⋯ ⋯ 0.73 0.76 0.56 Mixed salad ⋯ ⋯ ⋯ 0.73 0.58 0.39
Table VII
Deduced color-rendering tolerances for application in assessment of lamp performance.
Band limits (mµ ) Tolerances Single band Double band I 400–455 0.30 400–510 0.17 II 455–510 0.40 455–540 0.20 III 510–540 0.40 510–590 0.17 IV 540–590 0.30 540–620 0.13 V 590–620 0.20 590–760 0.09 VI 620–760 0.15
Table VIII
Asesssments of color-rendering performance of various types of fluorescent lamp.
Lamp type and equivalent color temperature Band limits (mµ )
Σ
P
L
y
¯
Σ
P
R
y
¯ Band ratio
(
Σ
P
L
y
¯
/
Σ
P
R
y
¯
) Band excess or deficit Excess over tolerance Single Double Single Double Daylight 6400°K lamp (a) 400–455 0.823 0.849 0.97 −0.03 0 −0.05 0 455–510 9.22 9.94 0.93 −0.07 0 −0.16 0 510–540 17.58 23.14 0.76 −0.24 0 −0.02 0 540–590 53.5 44.2 1.21 +0.21 0 +0.11 0 590–620 15.05 14.93 1.01 +0.01 0 −0.22 0.13 620–760 3.83 6.91 0.55 −0.45 0.30
0.43
Lamp type and equivalent color temperature Band excess or deficit Excess over tolerance Lamp type and equivalent color temperature Band excess or deficit Excess over tolerance Single Double Single Double Single Double Single Double
Daylight 6000°K lamp (b) +0.02 0 Daylight 6500°K lamp (c) −0.17 0 −0.05 0 −0.16 0 −0.11 0 −0.14 0 −0.16 0 −0.16 0 −0.21 0 −0.17 0 −0.01 0 −0.01 0 +0.19 0 +0.15 0 +0.07 0 +0.08 0 −0.06 0 0 0 −0.13 0.04 −0.06 0 −0.19 0.04 −0.11 0
0.08 0
Daylight 4000°K lamp (d) +0.28 0 Daylight 4000°K lamp (e) −0.12 0 +0.01 0 −0.10 0 −0.26 0 −0.07 0 −0.33 0.13 −0.15 0 −0.39 0 −0.23 0 −0.07 0 −0.09 0 +0.25 0 +0.06 0 +0.17 0.04 +0.08 0 +0.09 0 +0.09 0 −0.13 0.04 +0.10 0.01 −0.34 0.19 +0.10 0
0.40 0.01
Warm white 2900°K lamp (f) +0.41 0.11 Warm white 2900°K lamp (g) −0.02 0 −0.10 0 −0.07 0 −0.61 0.21 −0.11 0 −0.58 0.38 −0.18 0 −0.55 0.15 −0.24 0 −0.09 0 −0.06 0 +0.37 0.07 +0.13 0 +0.25 0.12 0 0 +0.13 0.07 −0.13 0 −0.20 0.11 −0.02 0 −0.53 0.38 +0.11 0
1.60 0