A LUMEN is a measure of luminous flux or quantity of light emmitted by the source.
Halogen lamps (like tungsten) have their light output quoted in watts, but really lumens is the important parameter, not how much power the lights consume. How many lumens does a halogen lamp output for a given wattage?
A LUMEN is a measure of luminous flux or quantity of light emmitted by the source. For example, a dinner candle provides about 12 lumens. A 60-watt incandescent lamp provides 840 lumens.
Lumens Per Watt (IpW) - A ratio expressing the luminous efficacy of a light source Here are some typical efficacies for various light sources:
1.4 lpW | |
Incandescent lamps | 10 to 40 lpW |
Halogen lamps | 20 to 45 IpW |
Fluorescent lamps | 35 to105 IpW |
Mercury vapor lamps | 50 to 60 IpW |
Metal halide lamps | 60 to 120 IpW |
High pressure sodium lamps | 60 to 140 IpW |
The values above for discharge lamps do not include the effect of the ballasts, which must be used with those lamps. Taking ballast losses into account reduces "system" or lamp ballast efficacies typically by 10 to 20% depending on the type of ballast used.
Labels: Halogen Lamps, Lumens, Residential Applications
posted by xinger @ 5:25 PM
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