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Coal and water-gas mixture, approximately 600 b.t.u.
Color matched by Bureau of Standards.
Burner (no reflector) from auto headlight “prest-o-lite.”
Calculated from Abbot’s data.
Tables (5)
Table 1
Black body luminous characteristics.
T, Degrees absolute
Radiant luminous efficiency
Brightness, b, in candles per cm.2 Computed for m=.00161
Brightness, b, in candles per cm.2 Observed, Hyde, Forsythe, and Cady
1200
0.00000602
0.0141
1400
0.0000557
0.242
1600
0.000282
2.08
1700
0.000541
5.10
5.06
1750
0.000726
7.69
7.63
1800
0.000957
11.3
11.2
1850
0.00124
16.4
16.2
1900
0.00158
23.2
23.0
1950
0.00198
32.3
32.0
2000
0.00246
44.4
44.0
2050
0.00301
59.9
59.6
2100
0.00364
79.8
79.6
2150
0.00436
105.
104.9
2200
0.00517
137.
136.4
2250
0.00606
175.
175.
2300
0.00706
223.
222.
2350
0.00816
281.
280.
2400
0.00935
350.
350.
2450
0.0107
433.
433.
2500
0.0120
531.
527.
2550
0.0135
645.
641.
2600
0.0151
780.
775.
2650
0.0168
934.
927.
3000
0.0309
2.83×103
4000
0.0807
2.33×104
5000
0.1190
8.40×104
6000
0.1353
1.98×105
7000
0.1352
3.67×105
8000
0.1258
5.82×105
10000
0.0987
1.115×106
Table 2
Values obtained for color matching lamp No. 5 against lamp No. 4 by a number of observers.
Observer
Volts for color match mean of three readings
Mean of three sets
Mean variation in volts
F. E. C.
1
103.39
2
.60
3
.71
103.57
0.19
A. H. T.
1
103.72
2
.71
3
.66
103.69
0.25
W. E. F.
1
103.80
2
.45
3
.79
103.68
0.13
R. S.
1
103.78
2
.47
103.63
0.31
R. D.
1
104.43
2
103.30
3
.51
103.75
0.20
I. K.
1
103.15
2
103.49
3
102.81
103.15
0.28
Table 3
Intercomparison of color scales.
Lamp
Color temperature degrees Kelvin
Nela
Bureau of Standards
Nela
Bureau of Standards
900 watt movie
3091
3085
3083
500 watt gas-filled
2848
2848
Table 4
Temperature and efficiency of tungsten lamps.
Volts
Watts
Type
Lumens/watt
Maximum temperature °K
115
15
Vacuum, inside frost
8.6
2470
“
25
“ “ “
9.5
2505
“
40
“ “ “
10.0
2535
“
50
Gas-filled, inside frost
10.2
2670
“
60
“ “ “
11.3
2695
“
100
“ “ “
13.4
2755
“
200
Gas-filled, clear
16.2
2865
“
300
“ “
17.8
2915
“
500
“ “
19.2
2965
“
1000
“ “
21.7
3030
“
1000
Stereopticon
24.2
3185
30
900
Movie
27.3
3290
115
10-kw
31.0
3350
“
200
Daylight
10.0
2860
“
500
“
11.2
2960
Table 5
Color temperature, brightness temperature, and brightness of various illuminants.
Coal and water-gas mixture, approximately 600 b.t.u.
Color matched by Bureau of Standards.
Burner (no reflector) from auto headlight “prest-o-lite.”
Calculated from Abbot’s data.