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This is the horizontal candle power in the direction in which the spectral intensities were measured.
This lamp has a horizontal coil of about 12 turns, and is in a tubular bulb about 1 inch in diameter and 2 inches long.
Table II
Spectral radiant intensities1 for a number of 115-volt lamps for general lighting purposes.
Wave-length (A)
Lamp Wattage
1500
1000
500
100
40
3500
1.15
0.75
0.225
0.030
0.0075
4000
4.05
2.22
0.700
0.098
0.0245
4500
9.0
5.0
1.55
0.238
0.067
5000
15.5
8.7
2.65
0.435
0.127
5500
22.2
12.7
3.95
0.66
0.200
6000
29.7
16.7
5.5
0.89
0.260
6500
36.0
20.1
6.5
1.12
0.355
7000
41.5
21.6
7.6
1.31
0.43
7500
45.5
25.5
8.5
1.47
0.48
8000
48.5
27.5
9.2
1.60
0.52
8500
50.5
28.8
9.6
1.70
0.56
9000
51.5
29.4
10.0
1.75
0.58
9500
52.0
29.2
10.2
1.80
0.60
10000
51.8
29.0
10.5
1.81
0.62
10500
51.0
28.7
10.1
1.82
0.62
11000
49.8
28.3
9.9
1.78
0.61
12000
45.7
26.5
9.3
1.69
0.60
13000
41.5
24.0
8.6
1.57
0.55
14000
36.8
21.2
7.7
1.43
0.50
15000
31.8
18.8
6.7
1.28
0.45
16000
27.5
16.5
5.8
1.14
0.40
17000
23.9
14.2
5.0
1.00
0.35
18000
20.8
12.5
4.7
0.87
0.31
19000
17.9
10.8
3.7
0.76
0.27
20000
15.5
9.5
3.3
0.66
0.24
22000
11.6
7.3
2.6
0.52
0.19
24000
8.7
5.5
2.1
0.39
0.15
26000
6.5
4.4
1.8
0.31
0.12
Microwatts per square centimeter at one meter per 50A.
Table III
Spectral radiant intensities1 for a number of lamps for special purposes.
The values given are the microwatts per 50A that fall upon one square centimeter at a distance of one meter from the lamp.
30-volt, 30-ampere lamp.
115-volt lamp.
10-volt, 7½ ampere lamp.
Operated at 7.5 amperes—see note 2, Table I.
Operated at 6.0 amperes.
21-candlepower lamp.
Table IV
Spectral steradiance of tungsten ribbon as observed through 702P glass bulb one mm thick
This is the horizontal candle power in the direction in which the spectral intensities were measured.
This lamp has a horizontal coil of about 12 turns, and is in a tubular bulb about 1 inch in diameter and 2 inches long.
Table II
Spectral radiant intensities1 for a number of 115-volt lamps for general lighting purposes.
Wave-length (A)
Lamp Wattage
1500
1000
500
100
40
3500
1.15
0.75
0.225
0.030
0.0075
4000
4.05
2.22
0.700
0.098
0.0245
4500
9.0
5.0
1.55
0.238
0.067
5000
15.5
8.7
2.65
0.435
0.127
5500
22.2
12.7
3.95
0.66
0.200
6000
29.7
16.7
5.5
0.89
0.260
6500
36.0
20.1
6.5
1.12
0.355
7000
41.5
21.6
7.6
1.31
0.43
7500
45.5
25.5
8.5
1.47
0.48
8000
48.5
27.5
9.2
1.60
0.52
8500
50.5
28.8
9.6
1.70
0.56
9000
51.5
29.4
10.0
1.75
0.58
9500
52.0
29.2
10.2
1.80
0.60
10000
51.8
29.0
10.5
1.81
0.62
10500
51.0
28.7
10.1
1.82
0.62
11000
49.8
28.3
9.9
1.78
0.61
12000
45.7
26.5
9.3
1.69
0.60
13000
41.5
24.0
8.6
1.57
0.55
14000
36.8
21.2
7.7
1.43
0.50
15000
31.8
18.8
6.7
1.28
0.45
16000
27.5
16.5
5.8
1.14
0.40
17000
23.9
14.2
5.0
1.00
0.35
18000
20.8
12.5
4.7
0.87
0.31
19000
17.9
10.8
3.7
0.76
0.27
20000
15.5
9.5
3.3
0.66
0.24
22000
11.6
7.3
2.6
0.52
0.19
24000
8.7
5.5
2.1
0.39
0.15
26000
6.5
4.4
1.8
0.31
0.12
Microwatts per square centimeter at one meter per 50A.
Table III
Spectral radiant intensities1 for a number of lamps for special purposes.
The values given are the microwatts per 50A that fall upon one square centimeter at a distance of one meter from the lamp.
30-volt, 30-ampere lamp.
115-volt lamp.
10-volt, 7½ ampere lamp.
Operated at 7.5 amperes—see note 2, Table I.
Operated at 6.0 amperes.
21-candlepower lamp.
Table IV
Spectral steradiance of tungsten ribbon as observed through 702P glass bulb one mm thick