Characteristics of Some New Mercury Arc Lamps

B. T. Barnes; W. E. Forsythe

doi:10.1364/JOSA.27.000083

Characteristics of Some New Mercury Arc Lamps

B. T. Barnes and W. E. Forsythe

Journal of the Optical Society of America
Vol. 27,
Issue 2,
pp. 83-86
(1937)
•https://doi.org/10.1364/JOSA.27.000083

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B. T. Barnes and W. E. Forsythe, "Characteristics of Some New Mercury Arc Lamps," J. Opt. Soc. Am. 27, 83-86 (1937)

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Lamp	Cooper Hewitt	Type H-1	Type H-2	Type H-3

Inside tube diameter (cm)	2.4	3.5	2.5	.4
Arc length (cm)	128	16.0	10.5	1.8
Vapor pressure (atm)	.0003	1.4	.4	28.5
Volts	71.9	150	67.5	251
Amp.	3.70	2.77	4.06	.401
Watts*	266	400	250	85.6
Lumens	6500	16000	7000	3400
Lumens per watt*	24.5	40	28	39.5
Candles per mm²†	.031	1.4	1.0	18

Principal Lines	Band of Wave-lengths	Spectral Intensities (μwper cm²at One Meter Distance from Lamp Axis)

17100–16900			34.4	11.9	6.9
15300			27.1	7.9	6.1
13955–13570			44	14.8	8.5
12100–11900			27.4	8.2	6.3
11289			35.7	12.5	7.8
10140		34.3	69	22.7	10.8
	7420–6830			3.3	3.75
	6830–6350		5.7	2.3	3.0
	6350–5950		5.6	1.9	3.1
5791–5770	5950–5615	26.3	127	55	19.2
5461	5615–5320	81	131	57.5	33.5
	5320–5060		3.5	1.24	2.2
	5060–4840		3.02	1.47	2.05
	4840–4650			.63	2.2
	4650–4475			.62	2.6
4358		82	92	44.5	27.1
4047		59	44.5	23.6	14.5
3663–3650		30	41	22.5	25.7
3341		2.7			3.2
3129		15			6.9
3022		.28			1.21
2967		.10			.73

	Inside Tube Diameter (cm)	Arc Length (cm)	Vapor Pressure (atm.)	Volts	Amp.	Watts*

Bare capillary-tube	.4	1.8	28.5	250	.403	85.6
d.c. Uviarc for 110v line	1.5	8.5	1.0	75	3.75	281

	Percent of Input Radiated in Spectral Lines
Wave-length	Bare capillary tube	d.c. Uviarc for 110v line
3663–3650	2.85	3.66
3341	.40	.27
3132–3126	1.73	2.53
3027–3021	.76	1.12
2967	.68	.55
2925	.19	.068
2894	.30	.20
2806–2803	.31	.39
2753	.24	.123
2701–2697	.23	.164
2655–2652	.37	.83
2537–2535	.064	1.14
2484–2482	.14	.33
2464	.065	.052
2447	.031	.043
2401–2399	.063	.142
2380–2378	.079	.128
2353	.089	.076
2323	.085	.047
2302	.084	.076
2259	.039	.048
Erythemal U.V.†	1.92	2.82
Erythemal U.V. of λ’s>2800A	1.38	1.37
Erythemal U.V. of λ’s<2800A	.54	1.45

Inside Tube Diam. (cm)	Arc Length (cm)	Vapor Pressure (atm)	Volts	Amp.	Watts*	Lumens	L/W	Candles per mm²†

.2	1.2	110	505	1.35	580	38,200	66	445

Band of Wave-lengths	Intensities‡
7250–6960	42
6960–6705	41
6705–6470	38
6470–6245	40
6245–6045	45
6045–5865	67
5865–5690	125
5690–5535	114
5535–5390	197
5390–5250	47
5250–5123	34
5123–5000	35
5000–4890	46
4890–4790	57
4790–4695	56
4695–4605	52
4605–4515	62
4515–4430	90
4395–4320	150
4280–4210	68
4210–4140	62
4080–4020	105
4020–3960	42
3960–3900	38

Source	Mercury Pressure (Atm.)	Percent of Light 6000–7600A
H-1 lamp	1.4	1.0
H-2 lamp	.4	.6
H-3 lamp	28.5	1.9
Water-cooled capillary arc	110	7.0
Sun		20.0
500 watt, 115 volt tungsten lamp		27.0

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