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Lumen
What does an Irish photographer do with a burned
out light bulb? Saves it for use in his dark room.
Lumen Outputs of Different Lamp Types
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Lumen Type
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Typical Lumen Output
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GLS 100 Watt
|
1300
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12V 50 Watt dichroic TH
|
950
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1500 Watt QI
|
33000
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Fluorescent: 18 Watt
|
1150
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Fluorescent: 30 Watt
|
2400
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36 Watt
|
3300
|
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36 Watt Triphos
|
3300
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58 Watt
|
4600
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Mercury Vapour: 250 Watt
|
13700
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Mercury Vapour: 400 Watt
|
24000
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Metal Halide: 250 Watt
|
20500
|
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Metal Halide: 400 Watt
|
38000
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High Pressure Sodium: 250 Watt
|
27500
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High Pressure Sodium: 400 Watt
|
47500
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Low Temperature Operation
Standard fluorescent fittings can be operated down to -20 degrees
C if a 38 mm lamp and special starter are used.
Lumen output will be 20% of normal when lamp is at -10 degree C.
The lower lumen output must be considered when calculating the number
of fittings required.
Plastic sleeves are available to provide some thermal insulation
to a lamp operating in a low temperature environment.
Lowest operational temperature of other types of discharge lamps:
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HPS ok down to - 60 degree C |
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MH ok down to - 20 degree C |
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MV ok down to - 5 degree C |
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